Clarksville and its neighboring hamlets sit at the eastern edge of the Helderberg Mountains in Albany County. The landscape is defined by a series of prominent elevations, including Wolf Hill, Bennett Hill, and Stony Hill, which overlook a network of creek valleys. Waterways like Onesquethaw Cr and the Vloman Kill wind through these hills, eventually feeding the southern reaches near Alcove Reservoir.
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1893 · Coxsackie
USGS Topo · 1:62,500
1893 · Durham
USGS Topo · 1:62,500
1893 · Albany
USGS Topo · 1:62,500
1894 · Coxsackie
USGS Topo · 1:62,500
1894 · Durham
USGS Topo · 1:62,500
1895 · Albany
USGS Topo · 1:62,500
1898 · Albany
USGS Topo · 1:62,500
1900 · Berne
USGS Topo · 1:62,500
1903 · Berne
USGS Topo · 1:62,500
1927 · Albany
USGS Topo · 1:62,500