The Mekong Delta, as a region, lies immediately to the west of Ho Chi Minh City, roughly forming a triangle stretching from Mỹ Tho in the east to Châu Đốc and Hà Tiên in the northwest, down to Cà Mau and the South China Sea at the southernmost tip of Vietnam, and including the island of Phú Quốc.
The Mekong has its source in the icy wastes of the eastern Tibetan plateau. It flows south and east, through China, Myanmar, Thailand, Laos, Cambodia and Vietnam, emptying into the South China Sea through a wide delta south of Ho Chi Minh City (Saigon).
The Mekong Delta is the region in southwestern Vietnam where the Mekong River approaches and empties into the sea through a network of distributaries. The Mekong delta region encompasses a large portion of southeastern Vietnam of 39,000 square kilometres (15,000 sq mi).The size of the area covered by water depends on the season.