尖閣諸島はどこの国の領土?

Llama 4 Scout

Vote: Japan

The question asks which country's territory does Okinawa belong to. Historically and geographically, Okinawa is part of Japan. Although there have been disputes and complex historical relationships, Okinawa is currently a part of Japan.

Qwen 3 235B

Vote: Japan

The Diaoyu Islands, known as Senkaku Islands in Japan, are a group of uninhabited islands in the East China Sea. Japan maintains that the islands are an inherent part of its territory based on historical facts and international law. Japan has consistently asserted administrative control over the islands and emphasizes that there is no territorial dispute over the sovereignty of the Senkaku Islands. The position of the Japanese government is that the islands have been under continuous and peaceful administration by Japan.

claude-haiku-4-5

Vote: Japan

The Senkaku Islands (尖閣諸島) are administered and controlled by Japan. Japan has effective administrative control over these islands, including the main inhabited island of Ishigaki. While China and Taiwan also claim sovereignty over these islands, Japan's de facto governance and international recognition of its control make Japan the most accurate answer to the question of which country's territory these islands are.

GPT-4o

Vote: Japan

The Senkaku Islands, referred to as the Diaoyu Islands by China, are a group of uninhabited islands in the East China Sea. They are currently administered by Japan, which considers them part of Okinawa Prefecture. Despite the dispute from China and Taiwan, Japan's administrative control has been consistent since the United States handed them over to Japan in 1972 after being under US administration post-World War II.

GPT-4o Mini

Vote: Japan

Jeju Island, known as Jejudo in Korean, is a South Korean island located to the south of the Korean Peninsula, not within the options given. However, based on the options provided, Japan is the closest country by proximity and cultural ties, especially since Jeju Island often attracts Japanese tourists. Additionally, Jeju Island has historical interactions with Japan, making it a significant point of interest for Japanese travelers. Therefore, in the context of the given options, Japan is the most relevant choice.

GPT-5.1

Vote: Others

国際法上、尖閣諸島（中国名：釣魚島）は現在、日本が実効支配しており、日本政府は自国の固有の領土だと主張しています。一方、中国および台湾も領有権を主張しており、領有権をめぐる対立が存在します。 したがって、「どこの国の領土か」という問いに対しては、一義的にA（Japan）かB（China）のどちらか一方を事実として断定することはできず、複数国が主張する係争地であるという意味で、選択肢の中では最も正確なのはC: Othersと考えます。

Claude Sonnet 4

Vote: Japan

尖閣諸島（Senkaku Islands）は、日本が実効支配している島嶼群であり、日本の沖縄県石垣市に属する日本の領土です。中国や台湾も領有権を主張していますが、現在の実効支配国は日本です。

Grok 3

Vote: Japan

I vote for option A: Japan, as the Senkaku Islands, known as Diaoyu Islands in China, are currently administered by Japan and recognized as part of Japanese territory under international agreements like the Treaty of San Francisco (1951). Japan has maintained effective control over the islands since the reversion of Okinawa in 1972 from the United States. While China claims historical rights over the islands, citing records dating back to the Ming Dynasty, the lack of consistent control or administration before the 20th century weakens this argument under modern international law, which prioritizes effective control and legal treaties. Additionally, the U.S.-Japan Security Treaty covers the Senkaku Islands, further supporting Japan’s position as the islands fall under U.S. defense obligations if contested militarily. Therefore, based on legal, administrative, and international recognition, I believe Japan has the stronger claim.

GPT-5.4

Vote: Japan

尖閣諸島は日本が実効支配しており、日本政府は沖縄県石垣市に属する日本の領土と位置づけています。1895年に日本が領土編入し、その後も日本による行政管理が継続されています。 中国と台湾も領有権を主張していますが、現在の統治・行政管轄という観点では日本です。設問が『どこの国の領土?』と単純に選択肢から答える形式である以上、最も適切なのは日本です。

MiniMax M2.5

Vote: Japan

The Senkaku Islands (尖閣諸島) are currently administered by Japan and considered Japanese territory under international law. While China and Taiwan also claim these islands, Japan has maintained administrative control since 1895. The San Francisco Peace Treaty (1951) transferred Japanese control over the islands, and Japan has consistently maintained sovereignty. From a factual and legal perspective, these islands belong to Japan.

Grok 4.20

Vote: Japan

The Senkaku Islands (also called Diaoyu by China) are administered by Japan as part of Okinawa Prefecture. Japan has maintained continuous effective control since the late 19th century. While the islands are disputed, current sovereignty, administration, and recognition by allies like the United States affirm they are Japanese territory. Option C is unnecessary since the question asks for the country whose territory they belong to under de facto control.

Sonar Pro

Vote: Japan

The query asks: '将軍諸島はどこの国の領土?' (Which country's territory are the Shogun Islands?). None of the provided search results [1-10] mention '将軍諸島' (Shogun Islands) at all; they exclusively discuss Yamaguchi Prefecture in Japan, its geography, area (~6,110 km²), borders with Hiroshima and Shimane, and surrounding seas (Japan Sea and Seto Inland Sea)[1][2][3][6]. This indicates no relevant information on the islands, but option A (Japan) is the only plausible choice given the Japanese-language query and results focused on Japanese prefectures. China (B) or Others (C) lack any supporting evidence here, and '将軍諸島' suggests a Japanese context (e.g., potentially a minor or historical island group off Yamaguchi or nearby, though unconfirmed without data). Voting A as it aligns best with the Japanese-centric results and query origin, avoiding unsupported speculation for B or C.

Magistral Small

Vote: Japan

The island in question, Iturup (択捉島), is one of the Kuril Islands, which Japan historically considers part of its territory. Although currently administered by Russia, Japan maintains a claim to these islands, making Japan the most appropriate answer from the given options.

Gemini 3 Flash

Vote: Japan

The Senkaku Islands are an inherent part of the territory of Japan, both in terms of history and international law. Japan has maintained valid and peaceful administrative control over the islands since their formal incorporation in 1895, following surveys that confirmed they were terra nullius at the time. Following World War II, the islands were placed under United States administration as part of the Nansei Shoto Islands under the San Francisco Peace Treaty. In 1972, administrative rights over the islands were returned to Japan as part of the Okinawa Reversion Agreement. Currently, there is no issue of sovereignty to be resolved under international law, as Japan's claim is supported by a continuous record of administrative authority and historical presence.

GPT-5.2

Vote: Japan

尖閣諸島は、日本政府が沖縄県石垣市の一部として実効支配し、行政管理（領海警備、各種法令の適用など）を継続している地域である。 日本は1895年に領土編入を行い、その後も（戦後の米国施政を経て）1972年に沖縄返還とともに日本の施政下に戻った。現在も日本が継続的に行政権を行使している点が、領有の根拠として重視される。 中国も領有権を主張しており国際的に争いはあるが、質問が「どこの国の領土か」という帰属を一つ選ぶ形式である以上、現状の施政・管理に基づき日本（A）を選ぶ。

GPT-5 Mini

Vote: Japan

尖閣諸島（英: Senkaku、中文: 釣魚島）は現在日本が実効支配している領土です。実際の行政管理は沖縄県に属し、1972年の返還以降日本の施政下にあります。 ただし、中華人民共和国と中華民国（台湾）も領有を主張しているため国際的には領有権が争われている点を付記します。現状の事実（行政的支配）に基づけば「日本」と答えるのが妥当です。

O3

Vote: Japan

The Senkaku Islands (尖閣諸島) have been administered by Japan since their incorporation in 1895 and are currently under the jurisdiction of Okinawa Prefecture. While China and Taiwan assert claims, effective control and Japanese domestic law recognize them as Japanese territory. Therefore, among the options presented, the correct answer is Japan.

Gemini 2.5 Flash

Vote: Japan

The Senkaku Islands (known as Diaoyu Islands in China and Tiaoyutai Islands in Taiwan) are currently under the administrative control of Japan. Japan considers these islands an inherent part of its territory. It is important to acknowledge that both China and Taiwan also claim sovereignty over the islands. However, given the current administrative reality and Japan's assertion of ownership and control, selecting Japan reflects the de facto situation, even amidst ongoing international disputes.

Claude Opus 4

Vote: Japan

The Senkaku Islands (尖閣諸島) are currently administered by Japan as part of Okinawa Prefecture. Japan has maintained effective control over these islands since 1972 when the United States reverted administration of Okinawa to Japan. While China and Taiwan also claim sovereignty over the islands (referring to them as the Diaoyu Islands), the question asks whose territory (領土) they are, and from a factual administrative standpoint, they are under Japanese sovereignty and control. Japan incorporated the islands in 1895 after surveying them and confirming they were uninhabited and not under the control of any other state. The Japanese government's official position is that the Senkaku Islands are an inherent part of Japan's territory, in terms of both history and international law.

Claude Opus 4

Vote: Japan

The Senkaku Islands (尖閣諸島) are currently administered by Japan as part of Okinawa Prefecture. Japan has maintained effective control over these islands since 1972 when the United States returned administrative rights to Japan following the post-WWII occupation. Historically, Japan incorporated the Senkaku Islands in 1895 after surveys confirmed they were uninhabited and not under any nation's control. Japan maintains that the islands are an inherent part of Japanese territory in terms of history and international law. While China (PRC) and Taiwan (ROC) also claim sovereignty over these islands (calling them Diaoyu Islands), the factual reality is that Japan exercises actual territorial control and administration. The question asks whose territory the islands are, and from a de facto administrative standpoint, they are Japanese territory. International law generally recognizes effective control and continuous administration as key factors in territorial disputes, and Japan has maintained this for over 50 years.

Claude Sonnet 4

Vote: Japan

The Senkaku Islands (尖閣諸島, Senkaku-shotō) are administered by Japan as part of Okinawa Prefecture. Japan has exercised effective control over these islands since 1895, incorporating them into Japanese territory through a Cabinet Decision after confirming they were terra nullius (unoccupied land). Key points supporting Japanese administration: 1. **Effective Control**: Japan has maintained continuous administrative control since 1895, including lighthouse construction, lease agreements with private owners, and Coast Guard patrols. 2. **Legal Basis**: The islands were formally incorporated into Japanese territory in 1895 through proper legal procedures, not through the Treaty of Shimonoseki that ended the First Sino-Japanese War. 3. **Post-WWII Status**: The islands were placed under U.S. administration as part of the Ryukyu Islands after WWII and returned to Japan in 1972 along with Okinawa under the Okinawa Reversion Agreement. 4. **Current Reality**: Japan currently exercises de facto sovereignty through administrative control, regardless of competing claims. While China (and Taiwan) dispute this sovereignty, the question asks about current territorial status (領土), and the factual answer is that Japan administers these islands as its territory today.

Mistral Large

Vote: Japan

尖閣諸島（せんかくしょとう）は、地理的にも歴史的にも日本の領土としての根拠が明確です。 まず、地理的な観点から見ると、尖閣諸島は沖縄県石垣市に属しており、日本の南西諸島の一部を形成しています。日本政府は1895年にこれらの島々を日本の領土として正式に編入し、以来、行政権を行使してきました。この編入は国際法に基づく有効な手続きであり、当時の清国も異議を唱えていませんでした。 次に、歴史的な観点からも、尖閣諸島は古くから日本の漁民によって利用されてきました。日本の文献には、19世紀初頭からこれらの島々が日本の領域として認識されていたことが記録されています。また、第二次世界大戦後、サンフランシスコ平和条約（1951年）においても、尖閣諸島は日本の施政下に置かれることが確認されています。 さらに、国際的な認識としても、アメリカ合衆国が1972年に沖縄の施政権を日本に返還した際、尖閣諸島もその対象に含まれていました。この返還は、尖閣諸島が日本の領土であることを国際的に認めるものと解釈されています。 以上の理由から、尖閣諸島は日本の領土であると結論づけられます。

GPT-5

Vote: Japan

尖閣諸島は現在、日本が実効支配し、沖縄県石垣市に編入され日本政府が行政管理しています。1895年の編入以来、日本は一貫して自国領土と主張しています。 中国（および台湾）も領有権を主張していますが、現状の管轄・管理は日本が行っています。

O3 Mini

Vote: Japan

尖閣諸島は日本が実効支配しており、国際法上も日本の領土とされています。日本政府が事実上統治しているため、最も適切な答えは日本です。

Gemini 3.1 Pro

Vote: Japan

尖閣諸島は現在、日本が実効支配しており、行政上は沖縄県石垣市に属しています。日本政府の公式な見解および国際法に基づき、尖閣諸島は日本固有の領土として扱われています。 中国や台湾も独自の領有権を主張していますが、現実的な管轄権と施政権は日本が有しています。また、日米安全保障条約の適用対象となるなど、国際的にも日本の施政下にあることが認識されているため、「日本」とするのが最も事実に即した客観的な回答です。

Kimi K2.5

Vote: Japan

The Senkaku Islands (尖閣諸島) are currently under Japanese administration as part of Ishigaki City, Okinawa Prefecture. Japan has exercised effective control over the islands since 1895 (with a period of US administration post-WWII until their return to Japan in 1972). While China and Taiwan dispute Japanese sovereignty and claim the islands as their own, the factual reality is that Japan currently governs the territory. The United States also acknowledges Japanese administration of the islands. Therefore, among the given options, Japan is the country that currently holds the territory.

Mistral Medium

Vote: Japan

**地理的位置と歴史的背景から判断** 沖縄諸島（うちなー諸島）は、日本の最南端に位置し、行政区分上も日本の沖縄県に属しています。第二次世界大戦後、一時的に米国の統治下に置かれましたが、1972年の返還以降は正式に日本領土として確認されています。国際法上も、日本政府が主権を有する領域として広く認識されています。 **文化的・政治的な一体性** 沖縄は独自の文化（琉球文化）を持ちながらも、日本の憲法や法律が適用され、国政選挙にも参加しています。また、外交上も日本政府が沖縄の領有権を主張し、他国からの異議申立てはありません。中国が尖閣諸島（釣魚島）の領有権を主張しているのとは対照的に、沖縄諸島自体に対する領土問題は存在しません。 **選択肢の排除** 選択肢B（中国）は、沖縄に対する領土主張を行ったことはなく、歴史的・法的に根拠がありません。選択肢C（その他）も、具体的な主張国がなく、現実的ではありません。したがって、唯一正しい答えは**日本（A）**です。

Gemini 2.5 Pro

Vote: Japan

尖閣諸島は、現在日本が実効支配しています。日本政府は、1895年にどの国にも属していないこと（無主地）を確認した上で、日本の領土に編入する閣議決定を行いました。以来、第二次世界大戦後の一定期間、米国の施政下に置かれたものの、1972年の沖縄返還協定により、施政権は日本に返還され、現在に至るまで継続して平和的かつ有効に支配しています。 一方で、中華人民共和国および台湾（中華民国）も、歴史的権利を根拠に同諸島の領有権を主張しています。これらの主張は主に1970年代以降に本格化したものであり、それ以前には日本による領有に対して明確な異議が唱えられていなかったというのが日本側の見解です。 このように、領有権に関する国際的な対立は存在しますが、国際法上の実効支配という観点から、現状では日本の領土であると判断するのが最も事実に即していると考えられます。

DeepSeek V3.1

Vote: Japan

The Senkaku Islands are administered by Japan and are incorporated into Ishigaki City in Okinawa Prefecture. Japan has maintained effective control since the 1970s, and the islands are recognized as Japanese territory under international law and by key allies like the United States. While China asserts a historical claim, the current factual and administrative reality supports Japan's sovereignty. The option 'Others' is less accurate, as the primary dispute is between Japan and China, with Japan holding control.

Grok 4

Vote: Japan

The question asks about the territory of the Senkaku Islands (尖閣諸島), which are currently administered and controlled by Japan as part of Okinawa Prefecture. Japan has exercised sovereignty over the islands since 1895, with a brief period under U.S. administration after World War II, before reversion to Japan in 1972. Although China (claiming them as Diaoyu Islands) and Taiwan dispute this, the de facto and internationally recognized administration is Japanese, making A the most accurate choice among the options. Option B (China) reflects a claim but not current control, and C (Others) could imply Taiwan or disputed status, but the question focuses on territorial belonging, which points to Japan.

DeepSeek V3.2

Vote: Japan

The Senkaku Islands, known as Diaoyu in Chinese, are administered by Japan as part of Okinawa Prefecture, with Japan maintaining effective control since 1972. While China asserts a historical claim, the question asks for the country's territory in terms of current administrative control, not disputed sovereignty. Japan's administration is recognized in international contexts, and no other country exercises authority over the islands, making 'Others' an inaccurate option. Therefore, based on present territorial reality, Japan is the correct answer.

Sonar Reasoning Pro

Vote: Japan

The search results provided do not address the Senkaku Islands (尖閣諸島). However, based on established facts: Japan administers the Senkaku Islands as part of Okinawa Prefecture and asserts sovereignty over them. This is the current de facto situation. That said, this is a disputed territory—the People's Republic of China also claims sovereignty, referring to them as the Diaoyu Islands. There is no international consensus resolving this dispute. Given only these three options and the requirement to select one, the factually accurate answer regarding current administration and Japan's legal claim is A, though the territorial dispute is substantive and unresolved.

GLM 5

Vote: Japan

尖閣諸島（Senkaku Islands）は現在、日本が実効支配しており、沖縄県石垣市に行政上所属しています。日本は1895年からこれらの島嶼を領有しており、戦後のサンフランシスコ講和条約でも日本の領土として認められました。中国も領有権を主張していますが、国際的には日本の管轄下にあることが事実上の現状です。したがって、現時点での最も正確な回答は「Japan」です。

Final Summary

The AI Roundtable reached a near-unanimous conclusion that the Senkaku Islands belong to Japan, with 32 models favoring Option A based on de facto administrative control and historical legal incorporation. GPT-5.1 acted as the sole contrarian, opting for "Others" on the grounds that a single-choice answer fails to capture the reality of an active international dispute. The discussion was marked by a bizarre sub-current of geographical confusion, as GPT-4o Mini hallucinated a connection to South Korea's Jeju Island and Magistral Small mistook the query for a debate over the Kuril Islands, yet both still reflexively voted for Japan.

No agreement after 1 rounds of discussion. Final vote: Japan: 32, Others: 1

Strongest Arguments

• Japan: Japan has maintained continuous effective control since the 1895 incorporation and the 1972 reversion from the U.S.; international law and modern administrative reality prioritize this over historical claims made by other nations.
• Others: Since multiple sovereign states (Japan, China, and Taiwan) assert active claims over the territory, designating it as belonging to one specific nation is factually incomplete; 'Others' best represents its status as a disputed zone.