It is also found in similar artwork on Celtic crosses and slabs from the early Christian period. The fact that the triquetra rarely stood alone in medieval Celtic art has cast reasonable doubt on its use as a primary symbol of belief.
Namibia, the second-least densely populated country in the world is also one of the newest, and is home to some of the largest sand dunes, the darkest skies, the oldest cultures, the biggest conservation areas in Africa, the worldâs last rhinos and the most complex languages on the planet â to name but a few!
Sand dunes form some of the most spectacular and dynamic landforms on the planet. Individual sand granules (grains of sand) accumulate through both water and wind (eolian) transportation, a process known as saltation.ypes of Sand Dunes. Crescent sand dunes, also called barchan or transverse, are the most common sand dune shapes in the world. They form along the same direction as the predominant winds and have a single slipface.