Located in the small town of Ribamontan al Mar, Playa de Somo is a two-mile-long, wide, beige-colored sand, and crescent-shaped beach that is situated at the mouth of a river named Rio de Castanedo. Also known as Playa de Somo Beach, Playa de Somo features great views of the lighthouse on Mauro Island that was built in 1860. Dogs are allowed on Somo beach between 8:00 pm and 9:00 am during high season and anytime during the off season.