The tower is situated in a commanding position on the crest of Marfa Ridge at the north west end of Malta, overlooking the natural harbour and potential enemy landing site of Mellieħa Bay, with clear views over to Comino and Gozo, and also eastward to the line of watchtowers along the north shore of Malta that linked it with the Knights headquarters in Valletta. It was the Knights' primary stronghold in the west of Malta, and was manned by a garrison of 30 men, with ammunition and supplies to withstand a siege of 40 days. The ammunition of other fortifications in the north of Malta, such as Aħrax Tower and Wied Musa Battery, was also stored in the tower.[2]