Six Flags México is a theme park located in the Tlalpan forest and borough, on the southern edge of Mexico City, Mexico. It is owned and operated by Six Flags, and is the most visited theme park in Latin America with 2.5 million annual visitors. It was previously known as Reino Aventura and was a Mexican-owned and run theme park; the orca whale Keiko (featured in the movie Free Willy) was then its principal attraction.