The Jordan River in the Arabah bordered it from Chinnereth to the Sea of the Arabah (the Salt Sea) with the slopes of Pisgah to the east.
KJV
The plain also, and Jordan, and the coast [thereof], from Chinnereth even unto the sea of the plain, [even] the salt sea, under Ashdothpisgah eastward.
ASV
the Arabah also, and the Jordan and the border thereof, from Chinnereth even unto the sea of the Arabah, the Salt Sea, under the slopes of Pisgah eastward.