The area of Lake Maninjau is 7.0 square meters.
It depends on what your idea of "major" is. The most beautiful (i.e attracts the most tourists)? or the most useful in terms of energy resources etc. Lake Sumatra and Kalimantan are definitely major though. Lake Toba, North Sumatra; Lake Batur, Bali; Lake Segara Anak, Mount Rinjani, Lombok; Lake Maninjau, West Sumatra are some. See the link below.
The area of Catahoula Lake is 121.406 square kilometers.
The area of Crawford Lake Conservation Area is 232 hectares.
The area of Pontiac Lake Recreation Area is 15.155 square kilometers.
The area of Island Lake Recreation Area is 16.187 square kilometers.
The area of Silver Lake Wilderness Area is 426.013 square kilometers.
The area of Lake Proctor Wilderness Area is 1,922,256.80064 square meters.
The area of Summer Lake Wildlife Area is 76.652 square kilometers.
The area of Pharaoh Lake Wilderness Area is 185.682 square kilometers.
The area of White Lake Wilderness Area is 45.4 square kilometers.
The area of Lake Toba is 1,130 square kilometers.
The area of Lake Berryessa is 83.77 square kilometers.