The waters of Shiloah were a soft-flowing stream or spring in Jerusalem. The name corresponds with Siloah and the later designation Siloam. It was regarded as Jerusalem’s only perennial spring.
Isaiah uses the gently flowing waters of Shiloah in contrast with more threatening powers. The image emphasizes the character of a quiet, soft-flowing watercourse.
The stream was later known as Siloam. The supplied material identifies it as a perennial spring associated with Jerusalem.