Perhaps it will be most instructive at this point to quote the words of the great Pathfinder himself.

The party arrived on the 21st of August on the Bear River, one of the principal tributaries of Great Salt Lake.

The narrative of Fremont proceeds: "We were now entering a region, which for us possessed a strange and extraordinary interest.

We were upon the waters of the famous lake which forms a salient point among the remarkable geographical features of the country, and around which the vague and superstitious accounts of the trappers had thrown a delightful obscurity, which we anticipated pleasure in dispelling, but which, in the meantime, left a crowded field for the exercise of our imagination.
"In our occasional conversations with the few old hunters who had visited the region, it had been a subject of frequent speculation; and the wonders which they related were not the less agreeable because they were highly exaggerated and impossible.
"Hitherto this lake had been seen only by trappers, who were wandering through the country in search of new beaver streams, caring very little for geography; its islands had never been visited; and none were to be found who had entirely made the circuit of its shores, and no instrumental observations, or geographical survey of any description, had ever been made anywhere in the neighboring region.

It was generally supposed that it had no visible outlet; but, among the trappers, including those in my own camp, were many who believed that somewhere on its surface was a terrible whirlpool, through which its waters found their way to the ocean by some subterranean communication.