Perdido River

Perdido River
Perdido Pass, the mouth of the Perdido River and Perdido Bay at Orange Beach, Alabama. Alabama State Route 182 crosses the inlet.
Location
Country	United States
State	Alabama and Florida
Physical characteristics
Source
• location	Escambia County, AL
Mouth
• location	Perdido Bay
• elevation	sea level
Length	65 miles (105 km)

The Perdido River, also historically known as Rio Perdido or by its native name of Cassaba,^[1][2] is a 65.4-mile-long (105.3 km)^[3] river in the U.S. states of Alabama and Florida; the Perdido, a designated Outstanding Florida Waters river, forms part of the boundary between the two states along nearly its entire length and drains into the Gulf of Mexico. During the early 19th century it played a central role in a series of rotating boundary changes and disputes among France, Spain, Great Britain, and the United States.

It rises in southwestern Alabama in Escambia County approximately 8 miles (13 km) northwest of Atmore. It flows south approximately 5 miles (8 km) to latitude 31°N, south of which it forms the remainder of the Alabama/Florida border. It flows generally east-southeast in a winding course and enters the north end of Perdido Bay on the Gulf of Mexico, approximately 10 miles (16 km) west of Pensacola.

The word "perdido" is Spanish for "lost".