Joining Marble Canyon on the north is Glen, 149 miles long, from the Paria to Frémont River. It has but one rapid of consequence. At high water, with the exception of this rapid, the tide sweeps smoothly and swiftly down with a majestic flow. The walls are homogeneous sandstone, in places absolutely perpendicular for about a thousand feet. I have stood on the brink and _dropped_ a stone into the river. The highest walls are 1600 feet. Next is Narrow Canyon, about 9 miles long, 1300 feet deep, and no rapids. It is hardly more than the finish of Cataract, a superb gorge about 40 miles long with a depth of 2700 feet, often nearly vertical. The rapids here are many and violent, the total fall being about 450 feet. At its head is the mouth of the Grand River. The altitude of the junction is 3860 feet.[9] Following up the Green, we have first Stillwater, then Labyrinth Canyon, much alike, the first 42¾ and the second 62½ miles in length. The walls of sandstone are 1300 feet. Their names well describe them, though the stillwater of the first is very swift and straight. There are no rapids in either. All these canyon names, from Green River Valley to the Grand Wash, were applied by Powell. Between Labyrinth and the next canyon, Gray, so called from the colour of its walls, 2000 feet high, is Gunnison Valley, where the river may first be easily crossed. Here the unfortunate Captain Gunnison, in 1853, passed over on his way to his doom, and here, too, the Old Spanish Trail led the traveller in former days toward Los Angeles. The Denver and Rio Grande Western Railway has taken advantage of the same place to cross. The 36 miles of Gray are hardly more than a continuation of the Canyon of Desolation’s 97 miles. Desolation is a fine chasm, whose walls are 2400 feet. The view on page 206 gives an excellent idea of their average character. The mouth of the Uinta River, not far above its head, is 4670 feet above the sea, while Gunnison Valley is 4083, showing a descent for the river, in Desolation and Gray, together of 587 feet. Desolation is full of rapids, some of them bad. Wonsits Valley, which succeeds Desolation, is the longest of the few valleys, being about 87 miles, with a width of 6 or 8 miles. There is a considerable amount of arable land, and along the river bank large groves of cottonwood trees. The river course is winding, the current sluggish, the width being 600 to 800 feet. At the head of this valley is Split-Mountain Canyon, 8 miles long, with ragged, craggy walls 2700 feet high. It contains a number of medium rapids. Island Park separates it from Whirlpool Canyon. It is a charming little valley, full of islands, a mere expansion of the walls, 9 miles long,—9 miles of rainbow, for the surrounding rocks and marls are of every hue. Whirlpool, 2400 feet deep, is about 14 miles in length and contains a number of rapids, but the whirlpools depend on the stage of water. Then comes the beautiful little Echo Park, really only the head of Whirlpool.