The northernmost island of the Penghu Archipelago, Mudou Island is surrounded by waters bristling with hidden reefs that have snagged many a passing ship. The most prominent feature of this island is a striking black-and-white striped lighthouse, 40 meters high, which was built in 1902 to provide ships with safe passage through the treacherous waters here. This is the tallest steel frame lighthouse in East Asia. At the southern end of the island is a charming white-sand beach, and the clear surrounding waters are filled with fish that make this a fine place for snorkeling.