Nevada

Nevada was a state of the United States of America. Much of it was desert.

In 1870, the town of Mercy was in danger of starvation after the arrival of Kahler-Jex, who was being hunted by his cyborg Kahler-Tek for his crimes as a war criminal. Around its border, a line of rocks was placed so that no one could escape or enter. (DW:  A Town Called Mercy)

In 1958, the Tenth Doctor arrived in Dry Springs, where he met and befriended Cassie Rice and Jimmy Stalkingwolf at Cassie's mother's diner. Following a short fight with agents of the Alliance of Shades and a Viperox battle drone, the trio were taken to Area 51. (DW: Dreamland)

In 2011, Angelo Colasanto and his granddaughter Olivia lived in Nevada. Olivia escorted the Torchwood team to his house. (TW: End of the Road)