Green Nail Oasis is a dependable spring in a rocky basin, marked by a single bright-green stalagmite-like stone that gives the site its name. The pool feeds a ring of date palms, scrub, and a shallow reedbed; two caravan pads sit on firm ground above flood level. A permanent tiefling waystation keeps the place: a shade awning, a tool shed, a cookfire circle, and a small cairn with posted water-share terms and a rack of spare cords of passage. The water is clear, slightly mineral, and reliable year-round except for two weeks after rare flash floods when it runs cloudy.