It follows the Snake River across Idaho, stretching roughly 400 miles (640 km) from the Wyoming border to Eastern Oregon in the xeric intermontane west.

Where irrigation water and soil depth are sufficient, sugar beets, potatoes, alfalfa, small grains, and vegetables are grown.

Natural fish assemblages in the region are typically a mix of mesothermal minnows and suckers, but some stenothermal salmonids and sculpins are also present.

Crop diversity is greater, temperatures are warmer, and the mean frost-free season is longer than in the Upper Snake River Plain and the Magic Valley.

[2] The Camas Prairie ecoregion is a cold, wet valley containing nearly level to rolling terraces, bottomlands, basalt plains, and, on the periphery, alluvial fans.

It is flanked by the semi-arid foothills of the Snake River Plain and the Idaho Batholith, which trap mountain runoff on the prairie.

The region covers 530 square miles (1,373 km2) in Idaho along the Camas River and is used for small grain and alfalfa farming, pasture, range, and wildlife habitat.

Sprinkler-irrigated land supports potatoes, alfalfa, and pasture; however, surface irrigation is far less common than in the Upper Snake River Plain.

The region covers 1,059 square miles (2,743 km2) in Idaho in the farthest eastern reaches of the Snake River Plain, approaching the Teton Mountains.

Big sagebrush, bluebunch wheatgrass, bluegrass, cheatgrass, rabbitbrush, squirreltail, needle-and-thread, Indian ricegrass, and fourwing saltbush are present.

The region covers 1,463 square miles (3,789 km2) in eastern Idaho, mostly along the interstate corridor from American Falls to St. Anthony.

The region is cool enough to have some regeneration capacity and still contains native plants, unlike the Mountain Home Uplands to the west.

[2] The Mountain Home Uplands ecoregion consists of arid, shrub- and grass-covered plains with hills and basalt-capped buttes.

Native grasses are much rarer and vegetative regeneration capacity is more limited than in the cooler Eastern Snake River Basalt Plains, which has more available moisture.

The second largest of the Snake River Plain subregions, it covers 2,945 square miles (7,628 km2) in southern Idaho, along the I-84 corridor between Boise and Gooding.

Many canals, reservoirs, and diversions supply water to the region's pastureland, cropland, and residential, commercial, and industrial developments.

Dams, irrigation diversions, pollution, and channel alteration have affected water quality, and over-watering from sprinkler-irrigated portions of the Eastern Snake River Basalt Plains has raised groundwater levels and created artificial wetlands.

However, scattered areas near rivers with enough water to leach salts from the soil support alfalfa or sugar beet farming.

Natural vegetation is dominated by Wyoming big sagebrush and associated grasses, such as bluebunch wheatgrass, Sandberg bluegrass, Thurber needlegrass, and Indian ricegrass.

Salt tolerant shrubs, including black greasewood, fourwing saltbush, inland saltgrass, shadscale, seepweed, occur on alkaline outcrops.