Geography
The Krishna district occupies an area of 8,727 square kilometres (3,370 sq mi),[3] comparatively equivalent to Corsica.[4] The district is divided into upland and coastal area. Kolleru Lake, one of India's most ecologically significant wetlands, lies partly within the district.
Hills
The main hill range of the district known as Kondapalli runs between Nandigama and Vijayawada with a length of about 24 km. The other impart hills are Jammalavoidurgam, Mogalrajapuram and Indrakiladri hills. On the Indrakiladri hills at Vijayawada stands the famous temple of Kanakadurga.
Hydrology
Prakasam Barrage at Vijayawada across Krishna River
The chief rivers of the district are the Krishna (length 1,280 km), Muniyeru (Muneru), the Tammileru and Budameru. Krishna river debouches in to the Bay of Bengal at Hamsala Divi and Nachugunta in this district. The district contains small hillstreams viz., Jayanthi, Kattaleru, Ippalavagu, Upputeru, Telleru, Ballaleru, Nadimeyeru.
Kolleru (Telugu: కొల్లేరు సరస్సు) is a large freshwater lake in India. Kolleru spans into two districts - Krishna and West Godavari. The lake serves as a natural flood-balancing reservoir for these two rivers. The lake is fed directly by water from the seasonal Budameru and Tammileru streams, and is connected to the Krishna and Godavari systems by over 68 inflowing drains and channels. The lake was an important habitat for an estimated 20 million resident and migratory birds, including the Grey or Spot-billed Pelican (Pelecanus philippensis). The lake was notified as a wildlife sanctuary in November 1999 under India's Wildlife Protection Act of 1972, and designated a wetland of international importance in November 2002 under the international Ramsar Convention. The wildlife sanctuary covers an area of 308 km².
Climate
The climatic conditions of the district consist of extremely hot summers and mild winters and may be classified as tropical. The period starting from April to June is the hottest. The annual rainfall in the region is about 1028 mm and is contributed to by the Southwest monsoon.
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