Kogin Orange kogi ne a kudancin Afirka, tsawonsa kusan kilomita 2,200, yana ratsa Afirka ta Kudu da Namibiya. Sunan kogin ne bayan gidan sarauta na Dutch na Orange. Yana tasowa a cikin tsaunin Drakensberg a Lesotho kuma yana gudana zuwa yamma ta Afirka ta Kudu zuwa cikin Tekun Atlantika a Alexander Bay, kan iyakar Afirka ta Kudu da Namibiya. Kogin kogin muhimmin tushen ruwa ne na ban ruwa kuma ana amfani da shi wajen samar da wutar lantarki.