English: Foldout map of the Southwestern United States with territories and "Mail Route" of the Overland Mail Company contracted for $600,000 per year in 1857. Service began when the "first eastbound stagecoach departed San Francisco on September 15, 1858, and the westbound stagecoach left St. Louis a day later." The "DAILY LINE, from St.Louis to Springfield, Mo." was through en:Tipton, Missouri until the tbd railway was extended in 1859 along the preceding stage route to "The George Shackelford Relay and Meal Station" in en:Syracuse, Missouri. The "southern route" through the 1854 Gadsden Purchase region was abandoned in 1861 for the central route through the Kansas and Utah Territories (former Pony Express Route, not shown).

ERRATA

• The serpentine line indicating an overland route between Fort Smith and Little Rock was via an Arkansas River "SEMI-WEEKLY LINE of STEAMERS carrying mail, freight, and passengers".
• Lake Tahoe (not labeled) is not depicted on the California/Utah territories' lines (later the California/Nevada state lines)
• "Wasatch Mountains" is depicted as a much larger part of the Great Basin Divide, extending from the Utah Territory, into the New Mexico T, and ending in California's Mojave Desert
• "Nicolette L" with the inflow "Nicolett Riv" having the same shape as the Spanish Fork River (into Utah Lake) is shown near 114 degW rather than 111 deg W
• "Sierra Madre

NAMES

• Features without labels: Sevier Lake/Sevier River,
• Outdated names (current name displays in popup): Grand Riv., Los Angelos, Rio Colorado/San Joaquin/, Sacramento City, Walker's L., Firebaugh's Ferry