First island chain 第一岛链

The first island chain refers to the first chain of major archipelagos out from the East Asian continental mainland coast. Principally composed of the Kuril Islands, Japanese Archipelago, Ryukyu Islands, ******, the northern Philippines, and Borneo; from the Kamchatka Peninsula to the Malay Peninsula. Some definitions of the first island chain anchor the northern end on the Russian Far East coast north of Sahkalin Island, with Sahkalin Island being the first link in the chain. However, others consider the Aleutians as the farthest north-eastern first link in the chain. The first island chain forms one of three island chain doctrines within the Island Chain Strategy.