The Sheldon-Hart Mountain National Wildlife Refuge Complex is a management unit of the United States Fish and Wildlife Service

United States Fish and Wildlife Service

The United States Fish and Wildlife Service is a federal government agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats...

. It comprises two wildlife refuge

Wildlife refuge

A wildlife refuge, also called a wildlife sanctuary, may be a naturally occurring sanctuary, such as an island, that provides protection for species from hunting, predation or competition, or it may refer to a protected area, a geographic territory within which wildlife is protected...

s, the Hart Mountain National Antelope Refuge

Hart Mountain National Antelope Refuge

Hart Mountain National Antelope Refuge is a National Wildlife Refuge on Hart Mountain in southeastern Oregon, which protects more than and more than 300 species of wildlife, including pronghorn antelope, bighorn sheep, mule deer, sage grouse, and redband trout...

 in Oregon and the Sheldon National Wildlife Refuge

Sheldon National Wildlife Refuge

The Sheldon National Wildlife Refuge is a national wildlife refuge located on the northern border of the U.S. state of Nevada. A very small part extends northward into Oregon. It is managed by the United States Fish and Wildlife Service as the Nevada component of the Sheldon-Hart Mountain...

 in Nevada, that are managed as a single unit from an office in Lakeview, Oregon

Lakeview, Oregon

Lakeview is a city in Lake County, Oregon, United States. The population was 2,294 at the 2010 census. It is the county seat of Lake County. Although it is an incorporated city, the municipal government refers to the community as "The Town of Lakeview", and bills itself as "Tallest Town in Oregon"...

.
The two national wildlife refuges are noncontiguous

Contiguity

A contiguity is a continuous mass, or a series of things in contact or proximity. In a different meaning, contiguity is the state of being contiguous...

 but are managed together. The two refuges protect sections of a common ecoregion

Ecoregion

An ecoregion , sometimes called a bioregion, is an ecologically and geographically defined area that is smaller than an ecozone and larger than an ecosystem. Ecoregions cover relatively large areas of land or water, and contain characteristic, geographically distinct assemblages of natural...

, the High Lava Plains

Northern Basin and Range (ecoregion)

The Northern Basin and Range ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency in the U.S. states of Oregon, Idaho, Nevada, Utah, and California. It contains dissected lava plains, rolling hills, alluvial fans, valleys, and scattered mountain ranges...

ecoregion, and many of the flora and fauna found here are common to both refuges.