river in Shanxi province
湋 is a rare kanji that refers specifically to a river in Shanxi province. Its standalone meaning is limited to this geographic name.
湋 combines 氵 (water) with 韋, which likely contributes the sound. The character is used as a proper name for a river, but the detailed historical development is uncertain.
The water radical 氵 beside 韋 suggests a river. Picture the Wei River in Shanxi flowing beside a tanned leather hide (韋), giving the river its name.
For イ, imagine an eagle (イーグル) soaring over the Wei River: the 'i' sound in eagle cues イ while the river flows below.