Yel'lowstone, a river of the United States, rises in a beautiful lake of the same name high up in the Rocky Mountains. Receiving numerous branches from the south, it flows northeasterly through Montana and empties into Missouri River, in North Dakota, in 48° N. and 104° W. It is 800 yards wide at its mouth; 1,000 miles long; and navigable for 700 or 800 miles. The Grand Cañon of the Yellowstone is 3,000 feet deep, and to one looking up from the bottom stars are visible in broad daylight. The grandeur of the cañon is at once heightened and diversified by the upper and lower falls, the latter being one unbroken and symmetrical expanse 350 feet in height. The beautiful lake from which the river issues is about 300 square miles in area, and is between 7,000 and 8,000 feet above the sea.