The Comet River is a river in Central Queensland

Central Queensland

Central Queensland is an ambiguous geographical division of Queensland that centres on the eastern coast, around the Tropic of Capricorn. Its major regional centre is Rockhampton and the Capricorn Coast and the area extends west to the Central Highlands at Emerald, north to the Mackay Regional...

 that starts to the south of Rolleston

Rolleston, Queensland

Rolleston is a small town on the Comet River in Central Queensland. It is located in the Central Highlands Regional Council local government area, west of Gladstone and northwest of Brisbane. Springsure, the nearest town lies south-east. Rolleston lies on the junction of the Carnarvon, Gregory...

. It then flows north through Comet

Comet, Queensland

Comet is a town in central Queensland, Australia. The town is located on the Capricorn Highway, north west of the state capital, Brisbane. At the 2006 census, Comet and the surrounding area had a population of 233....

 towards a confluence with the Nogoa River

Nogoa River

The Nogoa River rises on the Carnarvon Range in the Carnarvon National Park in Central Queensland and flows in a north easterly direction. The river ends where it meets the Comet River north of Comet. From this point the river is called the Mackenzie River....

 where they both become known as the Mackenzie River

Mackenzie River (Queensland)

The Mackenzie River is a seasonal tributary of the Fitzroy River in Queensland, Australia. It is created by the intersection of the Comet and Nogoa rivers flowing from the Expedition Range in Central Queensland....

. The Comet River rises on the Expedition Range

Expedition Range

Expedition Range is a mountain range within the Central Highlands sandstone region of Queensland, Australia. Robinson Creek cuts a 100 metres deep gorge through sandstone clifflines...

 north of Expedition National Park

Expedition National Park

Expedition is a national park in Queensland, Australia, 490 km northwest of Brisbane. It is named for the Expedition Range of mountains....

.

The Brown River is one of a number of tributaries and the Comet River Weir is the main water storage facility on the river. In the late 1990s the river was the site for a proposed new dam, although it was never built.