Lake Trasimeno (, ; ; Etruscan Tarsmina), also referred to as Trasimene or Thrasimene in English, is a lake in Italy, in the province of Perugia, in the Umbria region. The Lake is located in the south of the Po River and to the north of the nearby Tiber River, has a surface area of and it is the fourth for surface in Italy (it is slightly smaller than Lake Como). Only two minor streams flow directly into the Lake and none flows out. The water level of the lake fluctuates significantly according to rainfall levels and the seasonal demands from the towns, villages and farms near the shore.