Sungai Lasi, known as Soengailasi when it was part of the Dutch East Indies, is a district in the Solok Regency of West Sumatra, Indonesia.
The area is known for its fruit including durian, mangosteen, rambutan, duku, and Rambai in the hills around the villages of Pianggu and Taruang-Taruang.
The area is largely agricultural with rice paddies and fields.
The Sungai Lasi and Batang Pamo rivers are in the hilly area.
The area includes mixed dipterocarp lowland rainforest.