Trip Map

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Unfortunately Google didn’t chart the route past the Mexican border.
So I will describe it.
From Laredo to Monterrey and from there along the east side of Sierra Madre Oriental (route 85) to Victoria. Still following the mountain range south on route 85 to Ciudad Valles and continue until Axtla de Terrazas, there route 120 across the mountains to Jalpan de Serra and continue to San Juan de Rio.