The UT administration has written to Survey of India for the latest map of Sukhna Lake and its catchment area, which will be used in the final notification declaring Sukhna as a wetland under the Wetland (Conservation and Management) Rule, 2017.

Sukhna Lake in Chandigarh, Punjab, India, is a reservoir at the foothills (Shivalik hills) of the Himalayas. This 3 km² rainfed lake was created in 1958 by damming the Sukhna Choe, a seasonal stream coming down from the Shivalik Hills. Originally the seasonal flow entered the lake directly causing heavy siltation. To check the inflow of silt, 25.42 km² of land was acquired in the catchment area and put under vegetation. In 1974, the Choe was diverted and made to bypass the lake completely, the lake being fed by three siltation pots, minimising the entry of silt into the lake itself.