Washington County, New York is part of the Great Appalachian Valley (also known simply as the 'Great Valley') which is a long narrow valley strip often between tall mountain ranges. The county transitions from the Taconic Mountains to the Adirondack Mountains, and from the Lake Champlain Valley to Hudson River Valley. Much of the county is part of the slate valley of the Upper Taconic Mountains (Taghkanic, meaning 'in the trees'). The eastern boundary of Washington County is the New York–Vermont border, part of which is Lake Champlain. This is also the border with New England proper. The northern end of the county is
Lake Champlain and St. Lawrence Junction Railway pulling delivery wagons. The line was leased to the Canadian Pacific Railway in 1887 and survived into the 21st century as part of the CPR Farnham Division. Lake Champlain and St. Lawrence Junction Railway The Lake Champlain and St. Lawrence Junction Railway was a historic Canadian narrow-gauge railway operating in the Richelieu River valley of Quebec. The 1871 charter of the Philipsburg, Farnham and Yamaska Railway Company was renamed in 1875 and commenced operation between Stanbridge and Saint-Guillaume in October 1879. The line was leased to the South Eastern Railway (SER) in 1880. The rail line and locomotives were converted