San Simón Island is a small island located in the Ría de Vigo, off the coast of Galicia, Spain. It is known for its rich history and natural beauty, featuring lush vegetation and scenic views of the surrounding waters. The island is part of the Cíes Islands archipelago and is accessible by boat. Historically, San Simón Island served as a military base and a quarantine station. Today, it is a popular destination for visitors interested in exploring its historical sites, including old buildings and monuments. The island is also a peaceful spot for nature lovers and those seeking outdoor activities.