The Rangitoto Lighthouse, officially named the Rangitoto Beacon, is a concrete navigation beacon about 21 metres tall, on the eastern shore of Rangitoto Island in the Hauraki Gulf, off Auckland. Rangitoto is a young volcanic island, and the beacon stands as a landmark for boats moving through the gulf. The island is reached by ferry from downtown Auckland, and the beacon is one of the island's best-known sights.