The Ons Island is the main island of a small archipelago in the Ria de Pontevedra in Galicia, Spain. Ons belongs administratively to the municipality of Bueu, which has a regular ferry boat connection to the island, as have the mainland towns of Portonovo, Sanxenxo, Marín and Aldán. In 2020, lightning due to Subtropical Storm Alpha started a for…The Ons Island is the main island of a small archipelago in the Ria de Pontevedra in Galicia, Spain. Ons belongs administratively to the municipality of Bueu, which has a regular ferry boat connection to the island, as have the mainland towns of Portonovo, Sanxenxo, Marín and Aldán. In 2020, lightning due to Subtropical Storm Alpha started a forest fire.