Karanji Lake is a lake located in the city of Mysore in the state of Karnataka, India. The lake is surrounded by a nature park consisting of a butterfly park and a walk-through aviary. This aviary is the biggest 'walk-through aviary' in India. There is also a museum, the Regional Museum of Natural History which is located on the banks of this lake. The total area of Karanji lake is 90 hectares. While waterspread area is about 55 acres, the foreshore area measures about 35 hectares.