Guided Trekking Itineraries in Mongolia's Altai Range The trail doesn't exist on any map. It's a faint line pressed into the alpine grass by centuries of nomadic migration — yak hooves, horse caravans, and the boots of herders who never needed a GPS to know where they were going. You follow it anyway, upward through a boulder field still wet from yesterday's rain, until the valley opens below you like a secret kept by the mountains themselves. This is trekking in the Mongoli