יהושע, פרק י״ג, פסוק ט׳

Before detailing the specific borders and land assignments for each individual tribe, a comprehensive overview of the conquered territories east of the Jordan River is presented [רש״י]. The geographical boundaries begin at Aroer, situated on the edge of the Arnon River, and extend to include a unique city located directly within the river itself. This settlement was likely built on an elevated section inside the riverbed, keeping it safe from the rushing waters [ביאור שטיינזלץ].

Beyond the river, the region encompasses a broad, flat, and completely level plain [מצודת ציון]. This even stretch of land spans the entire distance between Medeba and the city of Dibon [ביאור שטיינזלץ].