What does Deuteronomy 3:13 mean?

The rest of Gilead and all of Bashan, Og’s former kingdom, I gave to half the tribe of Manasseh. (The whole region of Argob in Bashan was called the land of the Rephaim.) Deuteronomy 3:13 - Modern Text Bible

(Half the tribe of Manasseh received the remaining territory, including the area known for its legendary giants.)