This lake is remarkable for the pure and pellucid appearance of its water. The fish in it can be seen swimming at a great depth; and the vessels upon it seem to move in air. These effects are, probably, caused, in part, by the peculiar materials of the bed of the lake, and partly by extraordinary evaporation. This last idea sanctions the belief, that in this part of the country the quantity of rain is very great. Some places in the neighbourhood of this Lake are swampy, and some are elevated and fertile.
To the north and west of Lake Superior are several other lakes, the principal of which are the Lake of the Woods, Rainy Lake, Bear Lake, and Red Lake.[88]
Opposite to about the centre of Lake Superior, and on the river Mississippi, are the falls of St. Anthony. This river, above the falls, runs, principally, through Bear and Red Lake; one branch of it, however, runs below them pretty much in the direction of the Missouri River. Both below and above the falls of St. Anthony an almost innumerable number of rivers pour their waters into the Mississippi, some of which are several thousand miles in length. The Missouri is the principal source of {133} the Mississippi, and the latter name ought to be substituted for that of the former. Between the cascades of St. Mary, and the falls last mentioned, lies the North-West Territory.[89]
