Legend has it that the water nymph Agilla, madly in love with the handsome prince Trasimeno, seduced him and enticed him into the waters of the lake which was then given his name.
The lake has a surface of 128 square kilometres and a circumference of 45 kilometres and is the largest in the Italian peninsular and the fourth largest in the whole country.
Various small towns and villages are situated on the hills covered in olive groves which surround three sides of the lake. Its waters abound in fish. There are three islands, the largest isola Polvese, has recently become a nature reserve specializing in the repopulation of aquatic birds, isola Maggiore is the only inhabited island and the smallest is isola Minore.