Bayou Teche is a 125-mile-long (201 km) waterway in south central Louisiana in the United States. Bayou Teche was the Mississippi River's main course when it developed a delta about 2,800 to 4,500 years ago. Through a natural process known as deltaic switching, the river's deposits of silt and sediment cause the Mississippi to change its course every thousand years or so.

St. Landry Parish is a parish located in the U.S. state of Louisiana. As of the 2020 Census, the population was 82,540. The parish seat is Opelousas. The parish was established in 1807.