First island chain

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The first island chain is the first string of major Pacific archipelagos out from the East Asian continental mainland coast. It is principally composed of the Kuril Islands, the Japanese archipelago, the Ryukyu Islands, Taiwan (Formosa), the northern Philippines, and Borneo, extending all the way from the Kamchatka Peninsula in the northeast to the Malay Peninsula in the southwest. The first island chain is one of three island chain doctrines within the island chain strategy of US foreign policy. It is considered a strategic military barrier to accessing the wider Pacific Ocean given the relative shallowness of waters to the west of the first island chain, which has important implications for submarine detection. Much of the first island chain is roughly situated in waters claimed by the People's Republic of China (PRC). These include the South China Sea, within the disputed nine-dash line, as well as the East China Sea west of the Okinawa Trough.

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