Easton's Bible Dictionary

Pathros - the name generally given to Upper Egypt (the Thebaid of the Greeks), as distinguished from Matsor, or Lower Egypt (Isa. 11:11; Jer. 44:1, 15; Ezek. 30:14), the two forming Mizraim. After the destruction of Jerusalem by Nebuchadnezzar, colonies of Jews settled "in the country of Pathros" and other parts of Egypt.