Jaisalmer is almost entirely a sandy landscape, forming a part of the great Indian desert. The general aspect of the area is that of an interminable sea of sandhills, of all shapes and sizes, some rising to a height of almost . The hills in the west are covered with log bushes, while those in the east feature tufts of long grass. Water is scarce, and generally brackish; the average depth of the wells is said to be about . There are no perennial streams, and only one small river, the Kakni, which, after flowing a distance of , spreads over a large surface of flat ground and forms a lake called the Bhuj-Jhil. The climate is dry and healthy. Throughout Jaisalmer crops such as bajra, jowar, motif, and til, are grown; spring crops of wheat and barley are very rare. Owing to the scant rainfall, irrigation is almost unknown.