Mont. Code § 87-5-403
There is a Sun River game preserve described as follows: beginning at a point on the continental divide of the Rocky Mountains, due south of the head or source of the south fork of the north fork of Sun River, in what will be, when surveyed, section 8, township 18 north of range 10 west, Montana meridian; thence due north from the crest of the continental divide to the head of the south fork of the north fork of Sun River; thence northerly along and down the course of the south fork of the north fork of Sun River as it winds and turns to its confluence with the north fork of the north fork of Sun River; thence northerly along the course of the north fork of the north fork of Sun River as it winds and turns to its head or source; thence due north to the crest of the continental divide of the Rocky Mountains; thence along the crest of the continental divide of the Rocky Mountains southwesterly and southerly to the place of beginning, intending hereby to include in said game preserve all that territory lying between the south fork of the north fork and the north fork of the north fork of Sun River on the east and the continental divide of the Rocky Mountains on the west.
§ 87-5-403, MCA