The GR 440, also called Tour de la Montagne Limousine, is an official French long-distance hiking trail. It forms a loop, covering about 207 km with 4,900 m of elevation gain. As an official GR route, it is very well-marked with the classic white-and-red trail signs, making navigation straightforward.

The San Diego Trans-County Trail (SDTCT), aka the Sea to Sea Trail or the TCT, is an ~155-mile route from the eastern boundary of San Diego County near the Salton Sea (230ft below sea level) to the western edge of the county at the Pacific Ocean. The route connects Anza Borrego Desert State Park and Wilderness in the Colorado Desert (a part of the larger Sonoran Desert) to the world-famous Torrey Pines Natural Preserve.