Jefferson County, Administrative county in northern New York, US
Jefferson County is an administrative county in northern New York that spans forests, farmland, and shorelines shaped by natural boundaries. The St. Lawrence River forms a major border and includes the Thousand Islands region, where numerous small islands dot the waterway.
The territory was established as a county in 1805, separated from the original Albany County. Over time, boundary adjustments were made as it developed into an important part of New York State.
The area is deeply connected to military life, particularly through Fort Drum, where the 10th Mountain Division is based and shapes the local community.
Watertown is the largest city and serves as the administrative center, offering good transportation connections throughout the region. Visitors can find accommodations, dining options, and services to support a comfortable stay.
The Black River flows through the county and empties into Lake Ontario, creating a historically important water route and power source for the region's development. This river has long influenced economic activity in the area.
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