Kankaria Lake, which was earlier known as Hauj-E-Kutub, is the biggest lake in Ahmedabad. During the time of kings, this lake served as the bathing place for all the badshahs. Built by Sultan Kutubuddin in 15th century, this lake consisted of a water purification system. The lake is circular, however, at one point it opens into a walkway, which leads to garden called Nagina Wadi. Near the lake, there is a gym called Ambubhai Purani Vyayamshala. Today, the lake is a popular picnic spot with lighted walkways and food corners. This lake is located in the southern part of the city in Maninagar area.