The hills surrounding the lake area, towards the north east of Jaipur, have quartzite rock formations (with a thin layer of soil cover), which is part of the Aravalli hills range. Rock exposures on the surface in some parts of the project area have also been used for constructing buildings. From the northeast, the Kanak Vrindavan valley, where a temple complex sits, the hills slope gently towards the lake edge. Within the lake area, the ground area is made up of a thick mantle of soil, blown sand, and alluvium. Forest denudation, particularly in the hilly areas, has caused soil erosion, compounded by wind and water action. As a result, silt built up in the lake incrementally raises the lake bed.