Bethamangala is a small town in the Bangarpet Taluk of Kolar district in the state of Karnataka, India. It has a large man-made lake which is a popular picnic spot and supplies drinking water to the nearby mining city of Kolar Gold Fields ("KGF"), about 5 miles from Bethamangala. In the days of the British, prior to say 1957, Bethamangala was where the British workers of KGF went at weekends to sail and relax around the sailing clubhouse. It was also where Diana Dunlop kept her canoe.