Vava'u is the island chain of one large island and 40 smaller ones in Tonga. According to tradition Maui fished both Tongatapu and Vava'u but put a little more effort into the former. Vava'u rises 204 m above sea level. The capital is Neiafu, which is the second largest city in Tonga, situated at one of the best harbours of the world, the Port of Refuge. Vava'u is a prime fishing destination with its beautiful harbour and untouched seas. The Vava'u group measures about 21 km from east to west and 25 km from north to south. Vava'u had 15,485 inhabitants at the 2006 census total of 121 km². 3,900 lived in the capital Neiafu. The main island of Vava'u is 89.74 km², the second largest island in Tonga. Vava'u is a coral reef with superior oblique in the north up to 200 m high cliffs. On the south side of the island group is dissolved into many small islands and waterways. The largest of these waterways, the fjord-like Ava Pulepulekai channel extends 11 km inland from the harbor of Neiafu, the capital. The Vava'u island is a raised platform of coral cliffs on the north coast and a low and irregular coastline south that opens in a complex network of channels, bays and islands forming one of the best protected natural harbors in the Pacific. Vava'u is also home to the 'Ene'io Botanical Gardens, Tonga's only botanical garden.