Namibia is a Southern African nation with rich diamond reserves. Their production comes mostly from marine sources: diamonds that have been deposited on the ocean floor as a result of river movements and ancient tidal basin flows. There are also a few small, land-based mining operations. Marine mining is a difficult, costly, and highly mechanized process. De Beers is the main producer of diamonds in Namibia, having invested heavily in marine mining equipment and exploration vessels over the years. The limited artisanal mining in the country means the government has strong controls over production levels.