Vredefort crater

The Vredefort crater is the largest verified impact crater on Earth. More than 300 kilometres (190 mi) across when it was formed, what remains of it is in the present-day Free State province of South Africa. It is named after the town of Vredefort, which is near its centre. Although the crater itself has long since been eroded away, the remaining geological structures at its centre are known as the Vredefort Dome or Vredefort impact structure. The crater is calculated to be 2.023 billion years old (± 4 million years), with impact being in the Paleoproterozoic Era. It is the third-oldest known crater on Earth.
In 2005, the Vredefort Dome was added to the list of UNESCO World Heritage sites for its geologic interest.