Chemung County, NY 📍

Chemung County is a county located in the U.S. state of New York. It is part of the ‘Elmira, New York Metropolitan Statistical Area’ which encompasses all of Chemung County. Its county seat is Elmira.

Chemung County is in the southwestern part of New York State, along the Pennsylvania border, in a part of New York called the Southern Tier and is also part of the Finger Lakes Region. According to the U.S. Census Bureau, the county has a total area of 411 square miles (1,064.5 km2), of which 408 square miles (1,056.7 km2) is land and 3 square miles (7.8 km2) (0.64%) is water.

The Southern Tier Expressway runs through the County east-west near the Pennsylvania border, between Waverly, New York and Corning, New York via Elmira, New York.

http://en.wikipedia.org/wiki/Chemung_County,_New_York

🗺️ Maps
Map: North Lake Reservior
Terrain Map: Mahanoy Mountain

Interstate 86 in South Waverly

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For a couple of blocks, Interstate 86 in Waverly dips south of the New York State line into Pennsylvania. The highway is covered by a compact with Pennsylvania, that allows for NYS Police Patrols and NYS DOT maintenance, although felonies and fatal collisions are investigated by Pennsylvania police.
Map: Sand Lake
Map: Willis-Wilcox Lake Trail

Horseheads vs Corning, a size comparison

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Horseheads is certainly more sprawling than Corning, as the prior is kind of a suburb of Elmira. Corning is compact also due to geography and the rather narrow valley its situated in. 
Map: Empire State Topography