The world's largest table-top mountain, a 'mesa' (Spanish = table), is located in which U.S. state?

The Grand Mesa is the world's largest flat-topped mountain in the world, located in western Colorado in the United States. It has an area of about 500 square miles (1,300 km2) and stretches for about 40 miles (64 km) east of the city of Grand Junction between the Colorado River and the Gunnison River, its tributary to the south.

This table-top mountain reaches an elevation of about 11,000 feet (3,400 m) with much of the mesa located within the Grand Mesa National Forest. There are over 300 lakes, including many reservoirs created and used for drinking and irrigation water, scattered along the top of the formation. The Grand Mesa is flat in some areas, but quite rugged in others.

Geologically, the mesa is topped by a hard volcanic basalt, a layer formed 10 million years ago. Climate on the Grand Mesa varies by elevation with higher elevations being cooler and receiving more precipitation. The top of the mesa is more that two miles above sea level (3.2 km), with an alpine climate throughout the year. An accumulation of 20 to 30 inches of snow (50.8 cm to 76.2 cm) in the winter is typical.