The Dunedin Botanic Garden is New Zealand's first botanic garden and holds the status of six star Garden of International Significance. ArbNet, the global network for tree-focussed professionals, has accredited the Botanic Garden as level III. The Camellia Collection is rated as a Garden of Excellence by the International Camellia Society. The Botanic Garden celebrated its 150th anniversary in 2013, marking its position as New Zealand's first botanic garden. It occupies 30.4 hectares in North Dunedin at an altitude of 25 - 85 metres above sea level. The Garden has hill views from sunny lawns, more than 6,800 plant species and the song of wild native bellbirds, wood pigeons and tui. Its wide range of horticultural and botanical collections includes roses, the herbaceous and perennial borders, a rock garden, New Zealand native plants and four hectares of Rhododendron Dell with more than 3,000 rhododendrons. An important aspect of The New Zealand Native plant collection is the cultivation of rare and endangered native plant species. The geographic plant collections are an expression of the Victorian penchant for collection and growing plants from all around the world and displaying them in related groups. This collection has plants from temperate climates of North Asia, the South, Central and North Americas, Southern Africa, the Himalayas and the Mediterranean.