A conical mound near the center of a beautiful prairie called the "Deer Lodge". The mound stands "about thirty feet high, around the base of which are innumerable springs of hot water. On top of the mound a spring three feet in...
Approximately "fifty miles long and fifteen miles wide," Big Hole Prairie "is hemmed in by high mountains on every side except the southeast where Wisdom River passes out from it." Plate XLIX.