C. F. Keil and Franz Delitzsch on 1 Kings 4:19

1Ki 4:19 Geber the son of Uri, in the land of Gilead, i.e., as the apposition “the land of Sihon ... and of Og...” clearly shows, the whole of the Israelitish land on the east of the Jordan, as in Deu 34:1; Jdg 20:1, etc., with the simple exception of the districts placed under Bengeber and Ahinadab (1Ki 4:13 and 1Ki 4:14). אחד נציב, “one president was it who (was) in the land (of Gilead).” נציב cannot signify a military post or a garrison here, as in 1Sa 10:5; 1Sa 13:3, etc., but is equivalent to נצּב, the president (1Ki 4:7). The meaning is, that notwithstanding the great extent of this district, it had only one prefect.