Vernal (Mars)

Named after the Town in Utah, USA.

Because structures resembling springs on Earth were found there it is the scene of one of the most important discoveries on the quest of life on Mars. (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.