And rowers fear the project may imperil a leading regatta site where the smooth river is straight and the winds gentle.

WSJ: Real Rapids in Grand Rapids?

There is sailing, jet-boating, sandboarding and helicopter flights, or more gentle outdoor pleasures like chasing the reflections on a mirror-calm Gordon River cruise, riding through the rainforests on a restored heritage railway or being driven to the heart of it all in a comfortable 4x4.

BBC: Tasmania's wild wild west

Patagonia riders are eased into the five-day riding program with a gentle ascent and tour of Lake Toro before moving on to more advanced rides along the banks of the crystalline Serrano River.

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