National conservation areas (NCAs) and similarly designated lands are designated by Congress to conserve, protect, enhance, and manage public lands for the benefit and enjoyment of present and future generations. The Bureau of Land Management's National Landscape Conservation System includes 16 NCAs and five similarly designated lands in ten states. These lands feature exceptional scientific, cultural, ecological, historical, and recreational values. They differ tremendously in landscape and size, varying from the coastal beauty of California's 18-acre Piedras Blancas Light Station Outstanding Natural Area to the rugged desert vistas of Nevada's 1.2 million acre Black Rock Desert-High Rock Canyon Emigrant Trails NCA.
Natural resources are materials that occur naturally within environments, such as water, air, and minerals. A natural resource can also be a living thing, such as an animal or plant. Some natural resources can be found widely and in abundance. Other natural resources, in fact most, occur in small sporadic areas. Nearly all natural resources are exhaustible, meaning they can be depleted if they are not managed properly.