Hastings' Dictionary of the Bible (1898)
JA'ZER, Josh 21:39, or JAA'ZER, Num 21:32, a city of the Ammonites, near the river Jabbok, the ruins of which are still visible at Sar, about 15 miles from Hesban. Sea of, Jer 48:32, may be a lake existing in ancient times near the city of Jazer. There are round pools of water near Sar, but scholars have not agreed what the Sea of Jazer refers to.