In which country is the world's tallest roller coaster, as of December 2016?

Kingda Ka is a steel accelerator roller coaster located at Six Flags Great Adventure in Jackson, New Jersey, United States. It is the world's tallest roller coaster, the world's second fastest roller coaster, and was the second strata coaster ever built. It was built by Stakotra, a subcontractor to Intamin.

The train is launched by a hydraulic launch mechanism to 128 miles per hour (206 km/h) in 3.5 seconds. At the end of the launch track, the train climbs the main top hat tower, reaching a height of 456 feet (139 m) and spanning over a 3,118-foot-long (950 m) track by the end of the ride.

Kingda Ka is themed as a mythical tiger, named for the 500 lb (230 kg) Golden Tabby Bengal tiger who lived in an adjacent exhibit before moving to the park's safari. The ride's sign and station have a Nepalese style. The queue line is surrounded by bamboo, which augments the jungle theme. Jungle music is played during the wait and throughout the Golden Kingdom section of the park, which was built for the ride.

The hydraulic launch motor is capable of producing 20,800 peak horsepower (15.5 MW). Because of the high speed and open nature of the trains, the ride will not operate in light rain.