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Smith's Bible Dictionary
Se'chu. (the watch-tower). A place mentioned once only - in 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.
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Smith, William, Dr. Entry for 'Sechu'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/s/sechu.html. 1901.