Famous for bats since 1930 . Arnhem Cave, situated 125km from Windhoek, is 4,5km in length – the longest in Namibia and inhabites 6 different species of bats. A guided tour through the cave, will probably leave you with your most memorable experience of caving. The duration of the tour depends on how far you would like to explore the cave. No crawling is necessary and the tour could last up to three hours – if you desire. Arnhem Cave is sill in a completely natural state. It developed through the solution of limestone and dolomite from between thin layers of quartzite and shale.