Koonthankulam Bird Sanctuary or Kunthankulam is a 1.2933 km² (0.4993 sq mi) protected area declared as a sanctuary in 1994. It adjoins the tiny village of Koonthankulam in Nanguneri Taluk of Tirunelveli district, Tamil Nadu, India. It is just 38 km away from Tirunelveli (a bustling town on the banks of the Tambaraparani River). (8.58102°N 77.76123°E) It is composed of Koonthankulam and Kadankulam irrigation tanks, conveniently linked by tar road. This is the largest reserve for breeding water birds in South India.