South Lake is located near Atwell, New York and is the source of the South Branch Black River. South Lake is one of several Herkimer County lakes with a high acid content and is, therefore, not a big fish producer. The fish species present are brook trout and land-locked salmon. Boating is permitted. A canoe, rowboat or motorboat is needed to access the lake at the designated boat launch. The lake is a designated trout lake, so no ice fishing is allowed. The public is prohibited from trespassing on the private property exclusion areas around the camps. Private residents access their camps via a locked gate.