Northern Mojave–Mono Lake water resource subregion

Northern Mojave–Mono Lake water resource subregion (HUC 1809) is one of 10 water resource subregions within the California water resource region and is one of 222 water resource subregions in the federally organized United States hydrologic unit system.

The tiers of the classification system, in order from largest to smallest, are regions, subregions, basins (formerly accounting units), subbasins (formerly cataloging units), watersheds, and subwatersheds.

[1][2] The Northern Mojave–Mono Lake subregion is approximately 28,000 sq mi (73,000 km2) and includes closed desert basins that discharge into south-central California, including Mono Lake, Owens Lake, Death Valley, and the Upper Mojave Desert.

[3] The Northern Mojave–Mono Lake subregion is composed of two third-level hydrological units called water resource basins (formerly accounting units), each with its own 6-digit hydrologic unit code.

These two basins are further subdivided into a total of 11 water resource subbasins, each with its own 8-unit hydrologic code.