Nhill is a Martian

Mars

Mars is the fourth planet from the Sun in the Solar System. The planet is named after the Roman god of war, Mars. It is often described as the "Red Planet", as the iron oxide prevalent on its surface gives it a reddish appearance...

 impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

, 22 kilometers in diameter. It is located at 29°S, 103.4°W, southwest of the crater Llanesco

Llanesco (crater)

Llanesco is a Martian impact crater, 27 kilometers in diameter. It is located at 28.5S, 101.2°W, north of the crater Dinorwic. It is named after a town in Spain, and its name was approved by the International Astronomical Union in 1991...

 and northwest of the crater Dinorwic

Dinorwic (crater)

Dinorwic is a Martian impact crater, approximately 56 kilometers in diameter. It is located on the planet Mars at 30.4°S, 101.6°W, northeast of the crater Virrat and north of the crater Tugaske. To the northeast of Dinorwic is the crater Caxias, and farther north is the crater Llanesco. It is named...

. It is named after a town in Victoria

Victoria (Australia)

Victoria is the second most populous state in Australia. Geographically the smallest mainland state, Victoria is bordered by New South Wales, South Australia, and Tasmania on Boundary Islet to the north, west and south respectively....

, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

, and its name was adopted by the International Astronomical Union

International Astronomical Union

The International Astronomical Union IAU is a collection of professional astronomers, at the Ph.D. level and beyond, active in professional research and education in astronomy...

 in 1991. According to a surface age map of Mars based on US Geological Survey data, the area around Nhill is from the Noachian epoch, which places the area's age at 3.8 to 3.5 billion years ago. The crater is relatively shallow, and is only about 300 meters deep.