After snaking its way through the Eros Mountains east of Windhoek, past the airport – after which the traffic drops off – the B6 straightens and flattens out, heading for Gobabis, Namibia’s last sizeable town of note before the Botswana border some 316km away on the western fringes of the Kalahari. The B6 forms part of the Trans Kalahari Highway, the paved road that continues eastwards across the desert to Gaborone (around 800km), the capital of Botswana, with onward connections to South Africa. It’s a dull slog through dry, dusty and fairly featureless thornveld, unless there’s been some seasonal rain to soften the harsh landscape. The only relief comes from the occasional wildlife sighting: a troop of baboons lolloping over the road, a family of warthogs scuttling away from the wide trimmed verges, or a swooping hornbill heading for a tree. On the way, branching off south of the main road, there is a handful of guestfarms, as well as Namibia’s longest cave system.