Playa de Gulpiyuri

Playa de Gulpiyuri is a flooded sinkhole with an inland beach located near Llanes, Spain around 100 m from the Cantabrian Sea.

Roughly 40 meters in length, it is fully tidal due to a series of underground tunnels carved by the salt water of the Cantabrian Sea which allows water from the Bay of Biscay to create small waves. It is a popular tourist destination, natural monument and part of Spain's Regional Network of Protected Natural Areas.