uvs lake basin may also refer to ubsunur hollow (russian: убсунурская котловина, "ubsunorskaya kotlovina"), which is the western part of the drainage basin, or to over of protected areas covering the lake and its surroundings. the hollow forms the northern part of the great lakes depression, which has a surface of over . the hollow, and most of the drainage basin, are situated in the khövsgöl, zavkhan and uvs provinces of north-western mongolia, and the mongun-tayginsky, ovyursky, tes-khemsky and erzinsky districts of southern tuva.