More than 100,000 boreholes have been drilled in Namibia over the past century. One third of these boreholes have been drilled dry. An aquifer called Ohangwena II, on both sides of the Angola-Namibia border, was discovered in 2012. It has been estimated to be capable of supplying a population of 800,000 people in the North for 400 years, at the current (2018) rate of consumption. Experts estimate that Namibia has  of underground water.