This singular map he immediately undertook to delineate, and accordingly traced out a very long point of land between the rivers ...

which he represented as running into the great lake, at the extremity of which he had been told by Indians of other nations there was a white man's fort." The same people described plainly the Yukon River westward of the mountains, and told Mackenzie it was a far greater stream than the one he was exploring.

This was the first "hint" of the existence of the great Alaskan river which was ever recorded.

They also spoke to Mackenzie of "small white buffaloes" ( ?the mountain goat), which they found in the mountains west of the Mackenzie.
Whenever and wherever Mackenzie's party met these northernmost tribes of Athapascan Indians they were always ready to dance in between short spells of talking.

This dancing and jumping was their only amusement, and in it old and young, male and female, went to such exertions that their strength was exhausted.