ILLUSION LAKE. Illusion Lake is a small body of water seven miles southwest of Littlefield in southwestern Lamb County (at 32°51' N, 102°23' W). It is fed by Bull Draw, Goat Draw, and a series of other small streams. The local terrain is flat to gently sloping and is surfaced by loose sand that supports scrub brush and grass. On the east side of the lake, rolling sand dunes with moderate relief are mostly barren but support some herbs and grass cover.