The Maerpoort (which translates into Thin Passage) is 9,4 km long when measured from intersection to intersection. It has an easy average gradient of 1:41 and has an altitude variance of 230m. The summit views are exceptionally dramatic and it's one of the photographic hotspots in the Richtersveld. There is only just over 1 km of the total length of this poort which is technically complex. The entire balance of the poort is an easy meander across the sandy desert floor and a reasonably good speed can be maintained, with the only cautionary being the perpetual corrugations.
The views more than make up for the flat terrain as the composition of the geology changes around every corner with small black and ochre outcrops seemingly 'growing' out of the flat plains. Here and there a small shrub or small tree can be seen, but otherwise this poort is mountain desert in its purest form. Anyone wanting to access the campsites at Richtersberg, Tatasberg, Kokerboomkloof or Gannakouriep will need to traverse this poort first.
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