Thủ Thừa is a rural district of Long An province in the Mekong Delta region of Vietnam. As of 2003 the district had a population of 88,455. The di…Thủ Thừa is a rural district of Long An province in the Mekong Delta region of Vietnam. As of 2003 the district had a population of 88,455. The district covers an area of 489 km². The district capital lies at Thủ Thừa.