In 1806, Lewis and Clark followed separate Indian roads back across the Continental Divide. Lewis traveled up the Blackfoot River and over Lewis and Clark Pass on an easy route that led to where the vast treeless prairie rises dramatically into the reefs and ridges of the Rocky Mountain Front. There he anxiously traveled deeper into Blackfeet Indian Country to find the northernmost reach of the Missouri River. Their broader journey had carried them up the Missouri River through prairies, badlands, and grass-filled valleys to its headwaters, then across the rugged spine of the continent over an endless sea of mountains until they could canoe downstream to the Columbia River. Rather than empty wilderness, they encountered a land rich in people and resources, and, led by Indian guides over ancient trails, they marveled at the rugged scenery and the abundance of fish and wildlife.