South China Sea on the west
That would be the Adriatic Sea on the East coast, and the Tyrrhenian Sea on the West coast.
You may be thinking of the Ross Sea.
The Pacific Ocean.
The Atlantic Ocean lies off the west coast of Scotland but there is no ocean on its east coast, just the North Sea.
To the Northwest of Alaska there is the Chukchi Sea; to the Southwest of Alaska is the Bering Sea.
The East China Sea to the south, and the Yellow Sea to the west...
Ionian Sea (east coast)Mediterranean Sea (south coast)
Alaska is bordered by the Bering Sea, Bering Strait, and Chukchi Sea to the west.
The north sea
The Red Sea
Arabian sea
The Sea of Japan There are two, between North and South Korea and the China/Russia border area to the west, and the east coast of China to the West. The Sea of Japan lays to the West and the East China Sea is more to the South West.