Lake Trasimeno

Italy / Umbria / Passignano sul Trasimeno /
Lake Trasimeno or Trasimene (in Italian: Lago Trasimeno), is the largest lake in the Italian peninsula with a surface area of 128 km², slightly less than Lake Como. The Tiber River flows some thirty kilometers to the east of the lake, but the lake and the river are separated by hills: no major river flows directly into nor out of Lake Trasimeno, and the water level fluctuates significantly according to rainfall levels and the seasonal demands from the towns, villages and farms dotted round the shore.
Wikipedia article: http://en.wikipedia.org/wiki/Lake_Trasimeno
Nearby cities:
Coordinates:   43°8'14"N   12°6'10"E