A state government has stared down a lobbying campaign from logging advocates and will push ahead with plans for a large-scale koala national park while hitting pause on tree-felling.

Critics say the move will hammer jobs and undermine the nation's timber supply when harvesting within the proposed park's boundaries is paused from Monday.

The NSW government on Sunday revealed its long-awaited plan for the Great Koala National Park, an election promise to conserve the marsupial's habitat.

The plan will reserve 176,000 hectares of state forest - a far larger footprint than the logging industry wanted - to be connected with existing national parks to create a 476,000ha reserve, protecting more than 12,000 koalas in the state's north.

"We've decided to go for the largest option and there's

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