Tasman River between Tasman Lake in the foreground, and Lake Pukaki in the distance
|⁃ location||Tasman Glacier, Murchison Glacier|
|⁃ elevation||715 m (2,346 ft)|
|518 to 532 m (1,699 to 1,745 ft)|
|Length||25 km (16 mi)|
The river's headwaters are in Aoraki/Mount Cook National Park, where it is the outflow of the proglacial Tasman Lake. It is also fed by the glacial waters of the tributary Murchison River, from Murchison Glacier, and the short Hooker River, an outflow of the proglacial lakes of the Hooker and Mueller glaciers.
The Tasman River flows south for 25 kilometres (16 mi) through the wide flat-bottomed Tasman Valley in the Southern Alps and into the northern end of the glacial lake Pukaki, this forming part of the ultimate headwaters of the Waitaki hydroelectric scheme.