Poseidon's Gateway

Everyone knows it's too dangerous to swim in the water at Poseidon's Gateway due to the countless drownings and missing persons reported surrounding the area.

Poseidon's Gateway is the mouth of a sandy aqua river - an estuary; the sand churns at a strong current as it always flows to the east. Despite the danger, Theá-Neroú, a young female of the nearby town, uses the estuary for her own leisurely swimming.

However, one afternoon, the current drags her out to the mouth of the estuary to a mirrored wall; she's forced through it by the current and enter. To Theá-Neroú's shock, there's an entire world behind the reflection beneath the surface of Poseidon's Gateway; it was a society so grand and old. The inhabitants: Fishpeople; ruled over by a god named Poseidon who forever searched for his beloved.

(A story created by me).