After a long and exhausting journey, the king and his companions finally reach a place where they can stop and gather fresh strength. The primary approach among commentators is that the group arrived at the city of Bahurim, a location mentioned earlier in the story [רש״י, רד״ק, מצודת דוד]. Alternatively, another perspective suggests that the king and the people actually reached the plains of the desert, choosing to halt their journey there [ביאור שטיינזלץ].
Wherever they stopped, this pause provided essential rest [ביאור שטיינזלץ]. More specifically, it was a state of deep relaxation meant to restore the soul and completely refresh the travelers after the intense fatigue of the road [מצודת ציון].