No, Vietnam is a part of the Asian continent. It does have several islands in it's coastal waters, however.
The large island country east of Vietnam is the Philippines.
The former SOUTH Vietnam consisted of the Central Highlands; Mekong Delta; and the Coastal Regions.
Rhode Island
None, the ocean borders Vietnam's south & east. Nam is coastal nation.
Phu Quoc Island is biggest islandPhú Quốc, also known as Koh Trol in Cambodia, is the largest island in Vietnam.
Sumatra is part of the island chain of Indonesia, not in Vietnam.
Two of the main islands of Vietnam include Thổ Chu Island and Phú Quốc island. Also, in Vietnam there is the Con Dao islands.
Coastal, it has borders on the Mediterranean and the Red Sea.
Coastal plain
no
The two countries have borders with Vietnam, and were a way to move men and materiel from North Vietnam to South Vietnam avoiding the narrow coastal region.