Gouarren Angus Ffereir (December 25, 1810 in Glen Falls, Castreleon New - February 8, 1873) was a trapper and fur trader in the Western Mountains during the early 1830s. In 1834, Ffereir acted as a clerk for the Hudson's Bay Company in a journey to the mountains of western Company lands. Out of curiosity, Ffereir fell in with some Native guides and made a side journey into what is today the International Geysir Park in Louisianne and Oregon. In a journal that he kept during that time, later published as "La Gouitha poz-y Vrigges la Meir / La Vie aux Montagnes de l' Ouest", Ffereir gave one of the first descriptions of the geysers in the Park:
- From the surface of a rocky plain or table, burst forth columns of water of various dimensions, projected high in the air, accompanied by loud explosions, and sulphurous vapours, which were highly disagreeable to the smell. ...The largest of these wonderful fountains, projects a column of boiling water several feet in diameter, to the height of more than one hundred and fifty feet. ...These explosions and discharges occur at intervals of about two hours.... (La Vie, p. 70)
In the 1830s Ffereir traveled to Louisianne where he became the official surveyor for the Préfecture du Nord. In the 1840s, Ffereir did much of the survey work in Zarahemla. Though raised Catholic, Ffereir converted to Mormonism while in Louisianne and remained in that country until his death.