This is Chembarambakkam Lake, one of two big reservoirs that supply the city of Chennai with water. What appears to be a Chinese pagoda in the water is actually a decorative cover for a water pump. The road alongside the reservoir is a popular spot to cool off when the city is experiencing a heat spell, which is most of the time! Chembarambakkam Lake is 40 km. outside of Chennai off of NH 4 on the Chennai-Bangalore Highway.