The locality is bounded to the north and north-west by Cooby Creek and to the west by the Cooby Creek Reservoir (also known as Lake Cooby) which impounds the creek.
Despite the names, the Geham National Park is in neighbouring Mount Luke, while the Geham State Forest is in neighbouring Mount Luke and Merritts Creek.
The land use is predominantly agricultural, a mixture of grazing on native vegetation, production forestry, and crop growing.
Climate
The locality is in two climate zones with the humid subtropical climate (Köppen: Cfa) in the north of the locality and the oceanic climate (Cfb) in the south of the locality. Gehem has the most northerly oceanic climate at altitude in Australia.
History
Highfields Post Office opened on 1 January 1868 and was renamed Geham in 1876.
Highfields No. 2 State School opened on 4 April 1871 without any ceremony. It had an initial enrolment of 47 students with first headmaster John O'Beirne. It was renamed Geham State School in 1876. The school celebrated its 150th anniversary in 2021.
Geham Presbyterian Church was opened on Sunday 8 September 1878. It was built from timber on a 1⁄2-acre (0.20 ha) site donated by Mrs Black. It was re-erected in 1926.
There are no secondary schools in Geham. The nearest government secondary schools are Highfields State Secondary College (to Year 12) in Highfields to the south-west and Crows Nest State School (to Year 10) in Crows Nest to the north-east.
^Blake, Thom. "Geham Presbyterian Church". Queensland Religious Places. Archived from the original on 10 September 2023. Retrieved 23 June 2023.
^"Advertising". Darling Downs Gazette. Vol. XXXI, no. 7, 030. Queensland, Australia. 15 October 1887. p. 4. Archived from the original on 10 September 2023. Retrieved 10 September 2023 – via National Library of Australia.
^Anglican Church of Southern Queensland. "Closed Churches". Archived from the original on 3 April 2019. Retrieved 3 April 2019.