Neela Hauz biodiversity park, next to Sanjay Van in South Central Ridge, was restored in 2015-16. In 2014, of the 611 water bodies in Delhi, 274 were dead and remaining were in bad shape. Neela hauz is a freshwater lake which was slowly dying due to the dumping of waste. During ancient times it use to be the main source of water supply for the Rajput city of Qila Rai Pithora. During ancient times, its basin was recharged by the wider dense forests of Sanjay Van and its overflow drained in to Yamuna.