SHELAH, POOL OF she’ lə (בְּרֵכַ֤ת הַשֶּׁ֨לַח׃֙, pool of the aqueduct). KJV SILOAH, sĭ lō’ e (Neh 3:15).

A reservoir in Jerusalem near the Fountain Gate (Neh 3:15). It is thought by many to be identical with the King’s Pool (2:14) and with the “lower pool” (Isa 22:9). While some identify it with the Pool of Siloam, it is prob. better to regard it as a separate reservoir in the complex water system of Jerusalem which was fed by the Spring of Gihon.