Sihon king of the Amorites, who lived in Heshbon. He ruled from Aroer on the rim of the Arnon Valley, along the middle of the valley, up to the Jabbok River (the border of the Ammonites), that is, half of Gilead,
Sihon king of the Amorites is named first, with his rule centered in Heshbon and stretching from Aroer and the Arnon Valley up to the Jabbok, covering half of Gilead.
It begins the eastern record by identifying Sihon and the core of his domain.
1Now these are the kings of the land whom the Israelites struck down and whose lands they took beyond the Jordan to the east, from the Arnon Valley to Mount Hermon, including all the Arabah eastward: 2Sihon king of the Amorites, who lived in Heshbon. He ruled from Aroer on the rim of the Arnon Valley, along the middle of the valley, up to the Jabbok River (the border of the Ammonites), that is, half of Gilead, 3as well as the Arabah east of the Sea of Chinnereth to the Sea of the Arabah (the Salt Sea), eastward through Beth-jeshimoth, and southward below the slopes of Pisgah. 4And Og king of Bashan, one of the remnant of the Rephaim, who lived in Ashtaroth and Edrei. 5He ruled over Mount Hermon, Salecah, all of Bashan up to the border of the Geshurites and Maacathites, and half of Gilead to the border of Sihon king of Heshbon. 6Moses, the servant of the LORD, and the Israelites had struck them down and given their land as an inheritance to the Reubenites, the Gadites, and the half-tribe of Manasseh.