The _Monongahela_ is four hundred yards wide at its mouth. From thence is twelve or fifteen miles to the mouth of Yohogany, where it is three hundred yards wide. Thence to Redstone by water is fifty miles, by land thirty. Then to the mouth of Cheat river by water forty miles, by land twenty-eight, the width continuing at three hundred yards, and the navigation good for boats. Thence the width is about two hundred yards to the western fork, fifty miles higher, and the navigation frequently interrupted by rapids, which, however, with a swell of two or three feet, become very passable for boats. It then admits light boats, except in dry seasons, sixty-five miles further to the head of Tygart's valley, presenting only some small rapids and falls of one or two feet perpendicular, and lessening in its width to twenty yards. The _Western fork_ is navigable in the winter ten or fifteen miles towards the northern of the Little Kanhaway, and will admit a good wagon road to it. The _Yahogany_ is the principal branch of this river. It passes through the Laurel mountain, about thirty miles from its mouth; is so far from three hundred to one hundred and fifty yards wide, and the navigation much obstructed in dry weather by rapids and shoals. In its passage through the mountain it makes very great falls, admitting no navigation for ten miles to the Turkey Foot. Thence to the Great Crossing, about twenty miles, it is again navigable, except in dry seasons, and at this place is two hundred yards wide. The sources of this river are divided from those of the Potomac by the Alleghany mountain. From the falls, where it intersects the Laurel mountain, to Fort Cumberland, the head of the navigation on the Potomac, is forty miles of very mountainous road. Wills' creek, at the mouth of which was Fort Cumberland, is thirty or forty yards wide, but affords no navigation as yet. _Cheat_ river, another considerable branch of the Monongahela, is two hundred yards wide at its mouth, and one hundred yards at the _Dunkard's_ settlement, fifty miles higher. It is navigable for boats, except in dry seasons. The boundary between Virginia and Pennsylvania crosses it about three or four miles above its mouth. The _Alleghany_ river, with a slight swell, affords navigation for light batteaux to Venango, at the mouth of French Creek, where it is two hundred yards wide, and is practised even to Le Bœuf, from whence there is a portage of fifteen miles to Presque Isle on the Lake Erie. The country watered by the Mississippi and its eastern branches, constitutes five-eighths of the United States, two of which five-eighths are occupied by the Ohio and its waters; the residuary streams which run into the Gulf of Mexico, the Atlantic, and the St. Lawrence, water the remaining three-eighths.