A vocabulary of landscape — a landscape of words 1039 entries

hueco

WAY-koh
A natural hole or cavity in rock, especially in the Desert Southwest — a hollow in a boulder or cliff face that collects rainwater and holds it. Huecos are critical water sources for wildlife in arid terrain. In climbing, a hueco is a pocket or scoop in the rock face used as a hold.
Etymology
Spanish, meaning hollow or hole.
Notes
Hueco Tanks in West Texas is named for the rock basins that have made the site a critical water source and human gathering place for thousands of years.