Okhla Bird Sanctuary is a bird sanctuary at the Okhla barrage over Yamuna River. It is situated in Noida, Gautam Buddh Nagar district, on Delhi-Uttar Pradesh state border and known as a haven for over 300 bird species, especially waterbirds. In 1990, an area of 3.5 square kilometres (1.4 sq mi) on the river Yamuna was designated a bird sanctuary by the Government of Uttar Pradesh under the Wildlife Protection Act, 1972. The site is located at the point where the river enters Uttar Pradesh. The most prominent feature of the sanctuary is the large lake created by damming the river, which lies between Okhla village to the west and Gautam Budh Nagar to the east.The Okhla Bird Sanctuary (OBS) is roughly 4 square kilometres in size and is situated at the entrance of NOIDA in Gautam Budh Nagar di