Bromfield Swamp is a shallow crater of an extinct volcano and forms part of the headwaters of the North Johnstone River.

Bromfield Swamp is home to a population of Sarus Cranes, elegant long-legged waterbirds that look like a large heron. These cranes used to be found from Australia to Northern India but have now become almost extinct in Asia. Australia has one of the last breeding populations in the world, with an estimated 5,000 to 10,000 birds, of which three thousand live on the Atherton Tablelands.