Brownsville is a borough in Fayette County, Pennsylvania, United States, first settled in 1785 as the site of a trading post a few years after the defeat of the Iroquois enabled a post-Revolutionary war resumption of westward migration. The Trading Post soon became a tavern and Inn, and was soon receiving emigrants heading west as it was located above the cut bank overlooking first ford that could be reached to those descending from the Mountains. Brownsville is located 40 miles south of Pittsburgh along the east bank of the Monongahela River.
According to the United States Census Bureau, the borough of Brownsville, located as a county border town has a total area of 1.1 square miles, of which 0.97 square miles is land and 0.1 square miles, or 10.47%, is water—most of which is the Fayette County half of the Monongahela River between the community and the flatter lands of opposite shore West Brownsville in Washington County.
Wikipedia https://en.wikipedia.org/wiki/Brownsville,_Pennsylvania
Coordinates 40°1'25.267" N -79°53'2.169" E