Case file · Cosmic event
Tswaing crater
The round salt pan of Tswaing north of Pretoria, about 1.1 km wide, was long argued over as a volcano or an impact crater until a borehole core examined in 1990 confirmed an impact about 220,000 years ago.
1990 CE · -25.41, 28.08 · status: official
The account
Its Setswana name means 'place of salt', and people mined salt and soda there for centuries. It is one of the best preserved young impact craters in the world.