What you are seeing is the 'Man Sagar' Lake in Jaipur city. The lake underwent several rounds of restoration and enlarged in the 18th century by Maharaja Jai Singh II of Amber.
In the past, at the location of the lake, there was a natural depression where water used to accumulate. During 1596 AD, when there was a severe famine in this region there was consequent acute shortage of water. The then ruler of Amer was, therefore, motivated to build a dam to store water to overcome the severe hardships caused by the famine to the people inhabiting the region. A dam was constructed, initially using earth and quartzite, across the eastern valley between Amer hills and Amagarh hills. The dam was later converted into a stone masonry structure in the 17th century. The dam, as existing now (see picture), is about 300 metres (980 ft) long and 28.5?34.5 metres (94?113 ft) in width. It is provided with three sluice gates for release of water for irrigation of agricultural land in the down stream area. Since then, the dam, the lake and the palace in its midst have undergone several rounds of restoration under various rulers of Rajasthan but the final restoration in the 18th century is credited to Jai Singh II of Amer. During this period, a number of other historical and religious places, such as the Amer Fort, Jaigarh Fort, Nahargarh Fort, Khilangarh Fort, and Kanak Vrindavan Valley were also built in the vicinity. All of these places are now linked by a tourist corridor of roadworks.

Camera: SX130IS, handheld, standard settings, image slightly cropped and aslightly adjusted for light. Image resized to FAR requirements.