Besides the Royal Society of South Australia, Charles Fenner was very active was the Royal Geographical Society of Australasia (South Australian Branch), since 1996 called the Royal Geographical Society of South Australia. He joined the Society in 1921 and was made a Life Member in 1950. During this period he was active on the Council of the Society, being Honorary Secretary, 1925–33, Honorary Treasurer, 1930–31, and President 1931–32, but resigning on 14 February 1932 because of ill health. In 1933 the Society set up a Library and Publications Committee, which, under Fenner as Chairman, was extremely active, ‘at times assuming the role of virtual executive of the Society’ (Peake-Jones, 1985). This Committee soon spawned an Editorial Board. F. L. Parker was the first to bear the title of Editor, followed by Fenner from 1933–41.