Crivitz is an impact crater on Mars. The name was proposed by Stephan Gehrke in 2002, at the time a research associate of the TU Berlin working on cartographic software and a visiting researcher at the United States Geological Survey. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Mars large craters are named after deceased scientists, writers and others who have contributed to the lore of Mars. Small creaters (less than 60km) are named after small towns and villages.