Lake Apanas is the third largest lake in Nicaragua behind Lake Nicaragua and Lake Managua. However, it is the largest man-made lake in Nicaragua at about 21 square miles in size. The lake was created in 1964 when the Mancotal Dam was created on the Tuma river. The flow of water to Lake Apanas provide energy to a hydroelectric power plant.
Lake Apanas provides great freshwater fishing for both freshwater bass and tilapia, however the wind can cause the lake to be quite murky at times. The lake is good for swimming as well and there are numerous good entry points into the water.