Mavulis Island is the northernmost of the Batanes Islands and the northernmost island in the Philippines. It is part of the archipelagic province of Batanes. The island is uninhabited, but it is garrisoned by the Armed Forces of the Philippines who constructed a shelter for local fishermen, a water desalination plant, a helipad, lighthouse, and a fla…Mavulis Island is the northernmost of the Batanes Islands and the northernmost island in the Philippines. It is part of the archipelagic province of Batanes. The island is uninhabited, but it is garrisoned by the Armed Forces of the Philippines who constructed a shelter for local fishermen, a water desalination plant, a helipad, lighthouse, and a flagpole on the top of the hill on the island considered as the northernmost flagpole in the country.