Sukhna Lake is an ecologically sensitive zone and a vital green lung for Chandigarh:
* **Wetland Status:** Recognized as a National Wetland by the Government of India, highlighting its importance for biodiversity conservation. * **Migratory Birds:** During winter (November to March), the lake becomes a sanctuary for migratory birds from Central Asia and Siberia, including Siberian ducks, storks, and cranes. * **Air & Water Quality:** Surrounded by the Shivalik foothills and a dense forest cover, the air quality here is generally among the best in the city. Water quality is regularly monitored, though it faces seasonal challenges from agricultural runoff and siltation from the catchment area. * **Sukhna Wildlife Sanctuary:** Directly adjacent to the lake, this 26-square-kilometer sanctuary is home to sambar deer, pangolins, wild boars, and peafowl. * **Sustainability:** Motorized boats (except for police/rescue) are banned to prevent noise and water pollution. The administration conducts regular "Shramdaan" (voluntary labor) drives where citizens help remove weeds and silt.