Vellayani lake, or Vellayani Kayal as known in local Language,is the largest fresh water lake in (Trivandrum) Thiruvananthapuram district of Kerala India.
There was a move to drain the lake and use the reclaimed area for agriculture.It was resisted by local and environmentalists and has been shelved.
There is a boat race in the lake during Onam which attracts a huge crowd.