Tasman Glacier is the largest glacier in New Zealand, and one of several large glaciers which flow south and east towards the Mackenzie Basin from the Southern Alps in New Zealand’s South Island. At 23.5 kilometres (14.6 mi) in length, Tasman Glacier is New Zealand’s longest glacier. It is as much as 4 kilometres (2.5 mi) wide and 600 metres (2,000 ft) thick, and lies entirely within the borders of Aoraki / Mount Cook National Park. The glacier covers an area of 101 square kilometres (39 sq mi) and starts at a height of 3,000 metres (9,800 ft) above sea level. Snowfall during the winter and spring seasons may accumulate up to 50 metres (160 ft). After the summer melt, 7 metres (23 ft) may remain in the high altitude glacier head.