| Lake Sysmä | |
| Pushpin Map: | Finland |
| Location: | Joroinen |
| Coords: | 62.1667°N 69°W |
| Inflow: | Kiekka power station |
| Outflow: | via Huutokoski to the lake Jokijärvi and Haukivesi |
| Catchment: | Vuoksi |
| Basin Countries: | Finland |
| Area: | 33.096km2 |
| Shore: | 167.22km (103.91miles) |
| Elevation: | 88m (289feet) |
| Frozen: | December-April |
| Islands: | Lamposaari, Kaupinsaari |
Lake Sysmä (Finnish: 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.[1]
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.