The stratigraphy and structure of the Ugab - Goantagab area (north-western Namibia) has been an enigma and the subject of many studies for decades (e. g. Jeppe, 1952; Petzel, 1986, Swart, 1987, 1992; Kohonen, 1993), while the occurrence of cassiterite mineralisation has given rise to intense exploration and mapping in the 1980s. The position of the area at the junction of the intracontinental (Damara Belt s. s.) and coastal (Kaoko Belt) branches of the Neoproterozoic Damara Orogen, which, in fact, are genetically individual orogens merged together during the amalgamation of Western Gondwana, produced a complex structural pattern and stratigraphy, not easily correlated with the adjoining areas of either the Damara or the Kaoko Belt. Miller (1983), in defining various lithologically, stratigraphically and structurally distinct zones within the Damara Orogen, designated this complex area the "Southern Kaoko Zone", with its own stratigraphy and tectonometamorphic development. In this memoir, the work of Cees Passchier, Rudolph Trouw, Andre Ribeiro and many others, spanning more than two decades and based on a detailed structural analysis of the Ugab - Goantagab area, is summarised, presenting their solution to the problem of the complex geology of an orogenic triple junction. Over the duration of this long-term project ideas and perceptions naturally underwent change and refinement, as evidenced by the many papers and theses produced during this period (Appendix IV).