Haukivesi is a lake in southeastern Finland and a part of the Saimaa lake system. Haukivesi is the central basin of the system, collecting 80% of the water that eventually flows into Lake Laatokka through River Vuoksi. Its area is (8th). Like other lakes in the system, it has a convoluted shoreline with numerous islands and is divided into a number of smaller regions (selkä) such as Siitinselkä, Saviluoto, Tahkoselkä, Vuoriselkä, Kuokanselkä, Kuivaselkä, Heposelkä, Peonselkä, Tuunaanselkä, Hiekonselkä, Varparannanselkä, and Iso-Haukivesi. Haukivesi stretches from Varkaus to Savonlinna in a northeast-southwest direction. The northern part is shallow, at less than , but deepens toward the southeast, up to at Kuivaselkä.