Vembanad lake ( UPSC Prelims)

News Context

A recent study revealed that its surface area decreased by 27% from 1917 to 1990.
      ○ It is the largest brackish, humid tropical wetland ecosystem in Kerala.
      ○ It sustains the 3rd largest waterfowl population in India during the winter months.
      ○ The Vembanad Kol (Ramsar Site), Pathiramanal Island, and the Thanneermukkom saltwater barrier are situated on it.