Definition of Marginal sea

Many marginal seas are enclosed by island arcs that were formed from the subduction of one oceanic plate beneath another.

Marginal seas of the Pacific Ocean:

• The Bering Sea (separated by the Aleutian Islands)
• The Chukchi Sea (separated by Wrangel Island and the Bering Strait)
• The Sea of Japan (by the Japanese Archipelago)
• The Sea of Okhotsk (by the Kurile Islands)
• The South China Sea (by the Philippines)
• The East China Sea (by the Ryukyu Islands)
• The Yellow Sea (by the Korean Peninsula)
• The Philippine Sea (by the Ogasawara Islands, the Mariana Islands, and Palau)
• The Coral Sea (by the Solomon Islands and Vanuatu)
• The Tasman Sea (by New Zealand)