The handaxe of Libyan Desert glass (PL. XIIIb & FIG. I) was found on 23 June 1979, in the Sand Sea of S.W. Egypt, at latitude 25°o8' N, longitude 25° 35·5' E, near the southern boundary of the known distribution area of the glass. Lying just north of the Gilf Kebir, this part of the Sand Sea is characterized by an extensive field of linear dunes, trending almost exactly N-S, which are up to Ioom high, tens of km long, and separated by interdune corridors or ‘streets’ 2–5 km wide.