Lake Sysmä () is a medium-sized lake in the Vuoksi main catchment area. It is located in the region Southern Savonia and the municipality of Joroinen.Sysmä in the Jarviwiki Web Service. Retrieved 2014-03-14.
There is about 260 islands in the lake, most notable are Uitonsaari, Kaupinsaari, Laasonsaari, Käpysaari and Lamposaari.
Sysmä is also a Finnish municipality which is situated in Päijänne Tavastia and a lake in Ilomantsi.
See also List of lakes in Finland References