The State Oceanic Administration on Saturday released a string of geographic codes of the Diaoyu Island and some of its affiliated islets.
Protests against Japanese government's move to "purchase" and "nationalize" the Diaoyu Islands continued outside the Japanese Embassy in Beijing.
Six Chinese surveillance ships patrolled the waters around China's Diaoyu Islands amid few signs that tensions over the territorial dispute were subsiding.
The personal safety of Japanese citizens in China is protected in accordance with the law, Chinese Foreign Ministry spokesman Hong Lei said on Friday.
Senior Chinese leader He Guoqiang on Friday reiterated China's firm resolution to safeguard its sovereignty over the Diaoyu Islands.
The market share of Japanese electronic appliances brands is shrinking in China, amid a global decline and the tension over the Diaoyu Islands.
A senior international relations expert Friday described the Japanese government's move to "purchase" the Diaoyu Island and part of its affiliated islets as a reflection of the weakening of Japan's national strength.
Tensions surrounding the Diaoyu Islands are being stirred up single-handedly by Japan in an attempt to rewrite Japan's inglorious history of illegally stealing Chinese territory, Assistant Minister of Foreign Affairs Le Yucheng said on Sept 14.
China's permanent representative to the United Nations Li Baodong filed a copy of the Chinese government's Diaoyu Islands baseline announcement with the United Nations.
Japanese Prime Minister Yoshihiko Noda said Japan "will take all possible measures to ensure security".
Two Chinese surveillance ship fleets have arrived at waters around Diaoyu Islands and its affiliated islets Friday morning and started patrol and law enforcement there..
The All-China Federation of Trade Unions and the All-China Women's Federation issued statements on Thursday, expressing strong indignation toward and opposition against Japan's so-called "purchase" of the Diaoyu Islands.
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