Sirenia Noja S.L

The Sonabia Whale is a dive site reached by boat. With depths from 6 to over 20 m, it offers rocky corridors and formations. A protected area with rich marine life, mild currents, and low–medium difficulty, making it ideal for divers of all levels.

A prime dive site off Mouro Island, located at the island’s northwestern tip. The area features pillars that create an open cavernous zone with a striking visual impact.

Northwest of Castro Urdiales Bay, this shore dive explores remains of the mining past. Large anchors mark the old ore loading dock. With a maximum depth of 12 m and no usual currents, it is an accessible site, ideal for beginner divers.

Also known as Ostende Bay, this dive begins from the artificial beach and follows a calm landscape where sandy bottoms alternate with rocky formations that create natural corridors. It is ideal for try-dives, courses, and night dives, as each corner changes with the light and reveals something new.

Next to the Luchana cliffs lies Rabbit Island, a dive site with a rocky seabed, small caves, and channels ideal for exploration. Currents are usually mild, although at certain times of the year they can intensify.

On the southern breakwater of Castro-Urdiales harbor, we find an easy yet lively dive. The mix of breakwater rocks and sandy bottoms creates an ideal environment to observe a wide variety of fish, cephalopods, and crustaceans. It is a very popular area among divers and perfect for night dives.