What did Allan Cunningham discover?

Allan Cunningham made major discoveries such as the rich farming land of the Darling Downs (1827) which led to inland settlement of what is now southern Queensland, and Cunningham's Gap (1828). The discovery of Cunningham's Gap meant that landowners on the Darling Downs did not need to send their products overland to Sydney and markets, but could take the shorter and easier route of coastal shipping.