Can we draw the following hypothesis from the context?

Context:

The Taramakau River is in the northwest of the South Island of New Zealand. It rises in the Southern Alps, 80 kilometres due east of Hokitika, and immediately below the saddle of the Harper's Pass, and runs westward for 75 kilometres into the Tasman Sea 15 kilometres south of Greymouth.

Hypothesis: South Island is New Zealand's largest island territory
It's impossible to say