Bounded on the S by Jefferies Glacier, on the E by an unnamed valley glacier flowing N fom Jeffries Glacier into Granite Creek Valley, on the N by Granite Creek, and on the W and SW by Tana Glacier, 8 mi. S of Granite Range and 43 mi. N of Cape Yakataga, Chugach Mts.
Named in 1960 by U.S. Geological Survey (USGS) for J.B.Thompson, a prospector who, with J. B. Miller, hiked from Cape Yakataga across the glaciers to Granite Creek and returned the same way in 1906 or 1907.