What does Joshua 17:10 mean?

To the south, the land belonged to Ephraim, and to the north, it belonged to Manasseh. The sea was the western border. North of Manasseh was Asher, and east was Issachar. Joshua 17:10 - Modern Text Bible

(This verse sums up the borders, showing how the tribes' lands fit together, with Manasseh bordered by other tribes and the sea.)