Rupes Recta

Rupes Recta is a Linear Fault, or Rille, located on the Moon, in the South-Eastern part of the Mare Nubium, at about 22,1° South Latitude and 7,8° West Longitude.
The name is Latin for "Straight Fault", although this feature is more commonly known as "The Straight Wall". This is the most well-known Escarpment existing on the Moon, and it is also a VERY popular target for amateur astronomers. When the Sun illuminates the feature at an oblique angle, around Day 8 of the Moon's orbit, the Rupes Recta casts a wide shadow that gives it the appearance of a Steep Cliff.

This Fault has a length of approx. 110 Km, a typical width of 2–3 Km and a height of approx. 240–300 mt. Even though the Rupes Recta appears to be a Vertical Cliff on the Lunar Surface, the actual grade of the slope is relatively shallow (low).

To the West of the Rupes, lays the Crater Birt, which is about 10,5 miles in diameter. Also to the West is the Rima Birt Rille. At the Southern End of the Fault, there is a group of Hills often called the "Stag's-Horn Mountains", although this name is not officially recognized by the IAU. To the North-East of the Rupes, the Crater Alpetragius can be found, while to the East lays the Crater Thebit.