Tērvete Reservoir or Swan Lake is an artificial lake created in the early 80s of the last century, flooding the wetlands of the River Tērvete. At the beginning of summer 2014, a glassed bird watching tower was built at the water reservoir. It is 10 meters high, with 2 viewing platforms. The first is open and is 3 meters high, also available for people with reduced mobility. The second - at 6 meters - is glazed.