'Cities of the Plain' in the Bible

All the cities of the plain, and all Gilead, and all Bashan, even to Salchah and Edrei, cities from the kingdom of Og in Bashan.

And all the cities of the plain, and all the kingdom of Sihon, king of the Amorites who reigned in Heshbon, whom Moses smote him with the chiefs of Midian, Evi, and Rekem, and Zur, and Hur and Reba, princes of Sihon, dwelling in the land.