The Tasman Region's Clarke River is one of three rivers by that name in the South Island of New Zealand. It rises in the Kahurangi National Park from the eastern flanks of Mount Gomorrah (1,592 metres (5,223 ft)) flowing southeast then northeast before joining the Baton River 10 kilometres (6 mi) northwest of the township of Tapawera.

• New Zealand 1:50,000 Topographic Map Series sheet BQ24 - Tapawera
• Land Information New Zealand topographic names database