The Mountaineering Council of Scotland (MCofS) is appealing to Highland councillors not to support plans by SSE Renewables Developments for a 27-turbine, 67.5 megawatt wind farm at Dalnessie, near Lairg.
Members of the North Planning Applications Committee are due to discuss the development at their meeting in Inverness on Tuesday.
The final decision rests with the Scottish Government because the proposed windfarm has an installed capacity of more than 50 megawatts.
Highland Council planning officials are recommending that councillors approve the project which it is claimed will make a "useful contribution" to the Scottish Government's renewable targets.
But MCofS has said the turbines will ruin some of the best remaining wild lands in Scotland and turn the area into an "industrial site."
David Gibson, MCofS chief officer, said: "Just a few days ago Alex Salmond declared that in this Year of Natural Scotland, there is no better time to enjoy Scotland's outdoors.
"Unless he acts right now it will be the last time that people will have the chance to see the fabulous mountain landscapes round Dalnessie. After that they will be reduced to an industrial site."