Mer Rouge is a village in Morehouse Parish, Louisiana, United States. The name is French for "Red Sea". The population was 628 at the 2010 census. It is part of the Bastrop Micropolitan Statistical Area.
There is a hill that serves as a boundary between Mer Rouge and Bastrop, named Red Hill. The name "Mer Rouge" came from its founder, Davenport, after the red wavy soil of the hill. Another version of how Mer Rouge derived its name is that settlers looking across the prairie of red clover from atop of Red Hill called it a red sea.
On February 3, 1865, near the end of the American Civil War, two squadrons of the Illinois [cavalry attacked Mer Rouge and, according to the historian John D. Winters seized some horses, mules, while also freeing some enslaved African-Americans. They then "burned about 300,000 bushels of corn [and] some cotton" thus undermining the production power of the pro-slavery rebels.
In August 1922, in a case that would attract national attention, members of the Ku Klux Klan abducted two white men—Filmore Watt Daniel and Thomas Fletcher Richard—in Mer Rouge. After torturing and killing the men, the Klansmen disposed of their bodies in nearby Lake Lafourche.