The Biblical references to the “old pool” (Isa 22:11), “upper pool” (2Ki 18:17; Isa 7:3; 36:2), and “lower pool” (Isa 22:9) give no indication about their exact position in relation to the city of Jerusalem. Scholars generally believe that the “lower pool” (perhaps the same as “the Pool of the Canal” mentioned at Ne 3:15) may be identified with Birket el-Hamra at the southern end of the Tyropoeon Valley. But opinions vary considerably regarding the placement of the “upper pool.”​—See POOL OF THE CANAL.

A pool or reservoir of water, apparently S of the City of David where the Valley of Hinnom and the Central (Tyropoeon) Valley meet. (Ne 3:15) It seems that this pool was also termed “the lower pool.”​—Isa 22:9.