Ohigan

Ohigan (お彼岸, the other side of the river) is an otherworldly realm located in the sky. It appears in Weathering With You.

Overview
Ohigan is directly connected to the weather in the human world below. It is said to be even deeper than the oceans and is inhabited by mystical watery creatures, which ranges from small fish to dragons. It also hosts seaweed-like plants, giving it greenish pieces.

When a weather girl is completely sacrificed, she is transported here permanently.