Andhra Pradesh is an important and picturesque province in India comprising of interesting rock formations, many lakes and low hills. The deltas of the Godavari and Krishna are very wide and form a lake in between, called the 'Kolleru Lake', the largest fresh water Lake in the country. In the heart of Hyderabad is the famous Hussain Sagar, one of the largest man-made lakes in Asia. Durgam Cheruvu also known as "the Secret Lake" and the Shamirpet Lake are ideal weekend gateways located in the outskirts of Hyderabad. Nizamsagar is a huge reservoir constructed across the Manjira River and this place is known for its scenic beauty. The other famous little 'cheruvus' (lakes) of Andhra Pradesh include the Khambham Lake in Rajahmundry, Pakhal Lake in Warangal, and the Pulicat Lake in Nellore.