Frontierland or Westernland is the one of the areas of the Disney Magic Kingdom-style parks around the world.

Disneyland

Disneyland's Frontierland is home to the first Big Thunder Mountain Railroad roller coaster, which opened in 1979. It is also home to the Rivers of America, home of the popular Fantasmic! show and Mark Twain Riverboat and Columbia Sailing Ship, a replica of American Robert Gray's 18th century ship that circumnavigated the globe.

The Magic Kingdom

Magic Kingdom's Frontierland is home to two of the Magic Kingdom Mountains, Big Thunder Mountain Railroad and Splash Mountain along with the original Country Bear Jamboree .

Tokyo Disneyland

Known as Westernland. Tokyo Disneyland's Westernland is similar to the Magic Kingdom's Frontierland, though it does not have Splash Mountain, but rather Splash Mountain is in Critter Country, like Disneyland.

Disneyland Paris

Hong Kong Disneyland

Hong Kong Disneyland will not have Frontierland at opening, but might get it later as a second phase area, though some wonder where there would be room for it in the small park.