Posey County is the southernmost, southwesternmost, and westernmost county in the U.S. state of Indiana. Its southern border is formed by the Ohio River, and its western border by the Wabash River, a tributary to the Ohio. As of 2020, the population was 25,222. The county seat is Mount Vernon.
Posey County Courthouse in Mount Vernon
The Wabash River is a 503-mile-long (810 km) river that drains most of the state of Indiana, and a significant part of Illinois, in the United States. It flows from the headwaters in Ohio, near the Indiana border, then southwest across northern Indiana turning south near the Illinois border, where the southern portion forms the Indiana-Illinois border before flowing into the Ohio River.
A scene along the Wabash River, sketched in 1778 by Lt Governor Henry Hamilton en route to recapture Vincennes, Indiana during the American Revolutionary War
The former course of the Wabash River, running by the former site of the original Fort Recovery. The reproduction can be seen in the background, but it is not the original fort.
Forks of the Wabash at Huntington
U.S. Route 31 Business crossing of the Wabash River in Peru, Indiana in 2022