Available speleological and biospeleologic data for the Etosha National Park are summarised. Aikab hemicenote is descriptionbed and mapped. It contains the second largest subterranean lake in southern Africa, at 0.9 ha. Tourist development of the already protected and ecologically robust Aikab is suggested as a counter measure to discourage development of other unprotected and ecologically sensitive cave Iakes in Namibia Information on the most possible location of the 'lost' Achawachab Cave is presented to stimulate efforts to find it. At least seven other minor karst phenomena are treated. Keywords: Carbonate rocks, Cave lake, Chemical solution, Damara Orogen, Lapies, Microhabitats, Otavi Group, Otjovasado area, Ovambo Basin, Pinnacle fields, Saturated dolomite solution, Shallow phreatic-vadose tubes, Tsumeb Subgroup, Valley network.