What does Joshua 16:1 mean?

The land given to Joseph's descendants started at the Jordan River near Jericho, went east into the desert, and up from Jericho into the hill country of Bethel. Joshua 16:1 - Modern Text Bible

(This verse marks the start of the territory for Joseph's descendants (Ephraim and Manasseh), describing the boundaries beginning at the Jordan and moving into the hills.)