Symzonia: Voyage of Discovery

There was nothing to be gained by a longer continuance in this river, and I felt no disposition to penetrate into forests, frequented by animals large enough to be called mammoth, a name which appears to be applicable to all big things. At this place, fifty miles from its mouth, the river was full a mile in width, and twenty fathoms deep at low tide. Taking into consideration its unusual magnitude and depth, and the large animal seen upon its bank, I named it Mammoth River.