Grand Mesa is the world's largest flat top mountain. It is in western Colorado, overlooking Grand Junction. The mountain was formed by lava flows and glaciers. The top of the mountain is a hard lava cap. It appears as though the surrounding sandstone dominated terrains eroded away, leaving the mesa standing tall.
The height of the mountain ranges from 4000 to over 11,000 feet. I found a site that reported the higest point was 11,234 feet, and that the average elevation of the mountain was over 9000 feet. NOTE different sites report different elevation figures.
This gallery has pictures that we took on a tour in late August on the Highway 65 Scenic Byway.