The Orange River is named in honour of Prince William V of Orange by Col. Robert Gordon

Cullinan, P. (2003) Transcription and Translation of the Gordon Travel Journals [online] Available at: web.uct.ac.za [Accessed 10 August 2010]|Wallis, F. (2000), Nuusdagboek: feite en fratse oor 1000 jaar, Kaapstad: Human & Rousseau