Wikipedia
Rikkavesi is a medium-sized lake in eastern Finland. At approximately 63 square kilometres (24 sq mi), it is the 66th largest lake in Finland. Rikkavesi is situated in the municipalities of Kaavi, Outokumpu and Tuusniemi.
Rikkavesi is 101 metres (331 ft) above the sea level. Kaavinjärvi and Rikkavesi are connected by the Kaavinkoski Canal. Ohtaansalmi strait flows from Rikkavesi to Juojärvi. There is a marked shipping route from Saimaa to Rikkavesi.
Lake Rikkavesi was formed by glacial melting at the end of the Ice Age. The average depth is almost 11 metres (36 ft) and the maximum depth is almost 67 metres (219 ft).
There are many islands in Rikkavesi. The biggest island is Viitasaari, which is 95 hectares (0,4 sq mi). The total length of shoreline is 267 kilometres (166 mi).