The southwestern corner of the state consists of Adams, Valley, Washington, Payette, Gem, Boise, Canyon, Ada, and part of Valley, Owyhee, Elmore and Idaho counties. Big game hunt units 19A, 20A, 22, 23, 24, 25, 26 and 32A are managed by the McCall office, while 31, 32, 33, 34, 35, 38, 39, 40, 41 and 42 are managed by the Nampa office.

Diverse in terrain, the Southwest Region offers a wide range of outdoor sports and activities. From high mountain streams and lakes to lowland desert reservoirs, this areas rainbow trout fishing is unsurpassed. Mule deer hunting in the beautiful Owyhee Mountains remains as one of the Idaho hunter's favorite pastimes. Waterfowl hunting continues to grow in popularity and with record harvests.

Elevations in the southwest range from 1,688 at Hells Canyon dam to 10,582 at Elk Peak. The Idaho record game number four California bighorn sheep and number two Rocky Mountain elk, both taken in Owyhee county, can be seen on display at Fish and Game Headquarters.