Berthier was an historical county in the province of Québec.
- "BERTHIER, a county in the western part of the Province of Quebec, bordering on the St. Lawrence, has an area of 2,006,490 acres. It is drained by the Bayonne River and several smaller streams. Lake Maskinonge, in the N.E. part of the county, is about 4 miles long and 3 miles wide, and is the source of the Maskinongé River, an affluent of the St. Lawrence. The chief products are woollen goods, linens, flax, oats and tobacco. Chief town, Berthier(En haut). Pop. 19,836."
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