The Great Western Tiers (Palawa kani: Kooparoona Niara) are a collection of mountain bluffs that form the northern edge of the Central Highlands plateau in Tasmania, Australia.

[8] This escarpment divides the high, rocky, sparsely inhabited central plateau from the fertile lower land of the Meander Valley and the northern midlands.

[2] Unlike most of the bluffs this mountain is not visible from the Meander Valley, but is south of the escarpment.

[10] The face of the tiers has been eroded and retreated approximately 4 miles (6.4 km) since their formation, leaving the mountain Quamby Bluff as a solitary outlier.

Valleys under the tiers are filled with talus, mostly bounders with a 25% mix of soil formed from boulder weathering.