Los Angeles Crevasse

The Los Angeles Crevasse was a canyon presumably located on or near the site of the city of Los Angeles in what was once California at some point in Earth's far future. During the events of "The End of the World," Cassandra O'Brien claimed that her parents were buried there. Whether this area still existed after the National Trust reshaped the Earth's geography into the style known as "Classic Earth" is unknown, though it certainly ceased to exist after the Earth was destroyed when it's Sun expanded into a red giant.