Elsewhere, most of Xinjiang's rivers are comparatively short streams fed by the snows of the several ranges of the Tian Shan. Once they enter the populated areas in the mountains' foothills, their waters are extensively used for irrigation, so that the river often disappears in the desert instead of reaching the lake to whose basin it nominally belongs. This is the case even with the main river of the Tarim Basin, the Tarim, which has been dammed at a number of locations along its course, and whose waters have been completely diverted before they can reach the Lop Lake. In the Dzungarian basin, a similar situation occurs with most rivers that historically flowed into Lake Manas. Some of the salt lakes, having lost much of their fresh water inflow, are now extensively use for the production of mineral salts (used e.g., in the manufacturing of potassium fertilizers); this includes the Lop Lake and the Manas Lake.