Charles Ellicott Commentary Nehemiah 9:22

"Moreover thou gavest them kingdoms and peoples, which thou didst allot after their portions: so they possessed the land of Sihon, even the land of the king of Heshbon, and the land of Og king of Bashan." — Nehemiah 9:22 (ASV)

Divide them into corners. —Strict usage of the term would require: You did divide to them [these nations] in their boundaries.

And the land. —There is a double reference to Sihon, king of Heshbon. This and Bashan were taken as the pledge of the possession of Canaan.