river in Hebei province, creek
涖 centers on a specific waterway: a river or creek, particularly one in Hebei province. It is a proper-name kanji for a geographical feature.
涖 combines 氵 (water) with 位, which likely contributes the sound. It is a character created for a specific river name.
Water 氵 beside a position 位: picture a creek positioned beside a marked spot on a map of Hebei.
For レイ, imagine a ray of sunlight reflecting off the creek: ray -> レイ, and the light dances on the water.