What are lunar faults and ridges?

Lunar faults and ridges are similar to those on earth. One fault called strangely the Straight Wall is some 200 km long and about 300 m high. Lunar ridges run for hundreds of kilometers and may even form complex branch ridges.












What are the lunar walled plains?

Walled plains are lunar craters which are so vast that they resemble plains surrounded by circular walls of mountains. One of the walled plains, Clavius, is large enough to contain the whole of Switzerland within it.