Port Allegany serves as the central hub of this landscape, situated at the confluence where Twomile Cr and several hollow-fed brooks meet the Allegheny River. The terrain is defined by a series of deep valleys and ridges, including Champlain Hill and Steel Hollow, which dictate the winding paths of rural routes like Stagecoach Rd and Port-Turtlepoint Rd. To the north, the settlement of Turtlepoint sits near Simpson Cove, while the smaller community of Twomile is marked by Saint Gabriels Cem.
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1933 · Smethport
USGS Topo · 1:62,500
1934 · Coudersport
USGS Topo · 1:48,000
1937 · Smethport
USGS Topo · 1:62,500
1938 · Coudersport
USGS Topo · 1:62,500
1948 · Crosby
USGS Topo · 1:62,500
1948 · Emporium
USGS Topo · 1:62,500
1948 · Keating Summit
USGS Topo · 1:24,000
1948 · Norwich
USGS Topo · 1:24,000
1948 · Crosby
USGS Topo · 1:24,000
1950 · Norwich
USGS Topo · 1:24,000