Bosa Marina Porto Commerciale is formed by the causeway connecting Isola Rossa to the coast and by the island itself. A breakwater extending SSE from Isola Rossa provides further protection from the SW; a light (red post, 6 m in height) is exhibited from the head. The commercial pier is only usable in good weather during the summer. Anchorage can be obtained 400 m NW of the island in depths of about 16 m or E of the commercial pier in depths of about 5 m.