A city where streets and buildings smoothly turn into rivers and lakes

A city where streets and buildings smoothly turn into rivers and lakes, buildings are made of biomaterials similar to coral, birds and rare animals live on the roofs, electric cars running on hydrogen drive along the roads, braided with green vines, in the center of the city there is a big park with giant flowers glowing in the night, the atmosphere of a fantasy world where nature and technology merge into one.