Khirbet Mazin (a.k.a. Khirbet el Yahoud / Kidron Fortress) ) was an exceptional structure located in the Wadi Mazin, on the N.W shore of the Dead Sea. It was most likely built by the Hasmonean king Alexander Jannaeus who ruled over Judah between 103-67 BCE. The structure was multifunctional being used as a dry dock and slipway for boats sailing on the Dead Sea. The structure also encompassed a tower.