The canyon cannot be considered apart from its river any more than a geyser apart from its environment of hot spring and basin, and any consideration of the Yellowstone River begins with its lake. As compared with others of scenic celebrity, Yellowstone Lake is unremarkable. Its shores are so low and the mountains of its southern border so flat and unsuggestive that it curiously gives the impression of surface altitude--curiously because it actually has the altitude; its surface is more than seven thousand seven hundred feet above tide. If I have the advertisement right, it is the highest water in the world that floats a line of steamboats. The lake is large, twenty miles north and south by fifteen miles east and west; it is irregular with deep indentations. It is heavily wooded to the water's edge. All its entering streams are small except the Yellowstone River, which, from its source in the Absarokas just south of the park boundary, enters the Southeast Arm through the lowland wilderness home of the moose and the wild buffalo. The lake is the popular resort of thousands of large white pelicans, its most picturesque feature. That part of the Yellowstone River which interests us emerges from the lake at its most northerly point. It is here a broad swift stream of some depth and great clarity, so swarming with trout that a half-dozen or more usually may be seen upon its bottom at any glance from boat or bridge. A number of boats usually are anchored above the bridge from which anglers are successfully trailing artificial flies and spinners in the fast current; and the bridge is usually lined with anglers who, in spite of crude outfits, frequently hook good trout which they pull up by main strength much as the phlegmatic patrons of excursion-steamers to the Banks yank flopping cod from brine to basket on the top deck. The last time I crossed the Fishing Bridge and paused to see the fun, a woman whose face beamed with happiness held up a twenty-inch trout and said: "Just look! My husband caught this and he is seventy-six years old--last month. It's the first fish he ever caught, for he was brought up in Kansas, you know, where there isn't any fishing. My! but he's a proud man! We're going to get the camp to cook it for us. He's gone now to look for a board to draw its measurements to show the folks at home." From here to the river's emergence from the park the fishing is not crude. In fact, it taxes the most skilful angler's art to steer his fighting trout through boiling rapids to the net. For very soon the Yellowstone narrows and pitches down sharper slants to the climax of the falls and the mighty canyon.