Dry Gulch is a term used to describe a narrow, steep-sided ravine or canyon that is usually dry. It is often found in arid regions and is formed by the erosive action of water. The two crossword solutions for this term are ARROYO (6 letters) and COULEE (6 letters). An ARROYO is a dry creek bed or gulch that is usually found in the southwestern United States and northern Mexico. A COULEE is a deep, steep-sided ravine or gulch that is usually dry, but can contain water during times of heavy rain.