Osmansagar, better known as Gandipet, on the outskirts of Hyderabad is an excellent picnic spot. Osmansagar is one of the two lakes on the city’s periphery that supplies drinking water to the great metropolis. The lake is a reservoir created by a dam across the Isa, a tributary of the River Musi. Abutting the lake and the bund are lush gardens that provide the ideal ambience for an outing. Overlooking the lake is the heritage building, Sagar Mahal, built as a resort by the Nizam of Hyderabad and converted now into a lake resort managed by AP Tourism.