Joshua 16:3, 10

From there it went west to the border of the Japhletites and continued to the area of the Lower Beth Horon. Then it went to Gezer and ended at the sea.

The Ephraimites could not force the Canaanites to leave Gezer, so the Canaanites still live among the Ephraimites today, but they became slaves of the Ephraimites.