“Sechu” means the watch-tower

Sechu: a place mentioned once only -- (1 Samuel 19:22) --apparently as lying on the route between Saul's residence, Gibeah, and Ramah (Ramathaim-zophim), that of Samuel. It was notorious for "the great well" (or rather cistern) which it contained. Assuming that Saul started from Gibeah (Tuleil el-Ful), and that Neby Samwil is Ramah, then Bir Nebolla (the well of Neballa) just south of Beeroth, alleged by modern traveller to contain a large pit would be in a suitable position for the great well of Sechu.