Where is the large 600 m (2,000 ft) high mesa known as the Jugurtha Tableland?

Question

Concentric circles on the sea floor near Japan, about 2 m (7 ft) in diameter with intricate ridged radial lines and valleys of sand, are what?

Answer 1

Tunisia
The Tableland is an inverted relief, where millions of years ago the land level of the mesa was the bottom of a valley which became the high point in a plain as the surrounding softer hills have worn away. Similar inverted topographies have been discovered on Mars.