Altun Ha /ɑːlˈtuːn hɑː/ is the name given to the ruins of an ancient Mayan city in Belize, located in the Belize District about 30 miles (50 km) north of Belize City and about 6 miles (10 km) west of the shore of the Caribbean Sea. The site covers an area of about 5 miles (8 km) square. Stones from the ruins of the ancient structures were reused for residential construction of the agricultural village of Rockstone Pond in modern times, but the ancient site did not come to the attention of archeologists until 1963. The Old Northern Highway connects Altun Ha to Belize's Northern Highway, and the site is accessible for tourism. The largest of Altun Ha's temple-pyramids, the "Temple of the Masonry Altars", is 54 feet (16 m) high.