Mountain
Heights of mountains are typically measured above sea level. Using this metric, Mount Everest is the highest mountain on Earth, at . There are at least 100 mountains with heights of over above sea level, all of which are located in central and southern Asia. The highest mountains above sea level are generally not the highest above the surrounding terrain. There is no precise definition of surrounding base, but Denali, Mount Kilimanjaro and Nanga Parbat are possible candidates for the tallest mountain on land by this measure. The bases of mountain islands are below sea level, and given this consideration Mauna Kea ( above sea level) is the world's tallest mountain and volcano, rising about from the Pacific Ocean floor.
Mount Greylock
Mount Greylock is a 3489 foot (1069 meter) mountain located in the northwest corner of Massachusetts, the highest point in the state. Its summit is in the western part of the town of Adams (near its border with Williamstown) in Berkshire County. Although technically it is geologically part of the Taconic Mountains, Mount Greylock is commonly associated with the abutting Berkshire Mountains to the east. The mountain is known for its expansive views encompassing five states and the only taiga-boreal forest in the state. A seasonal automobile road (open annually from late May through November 1) climbs to the summit, topped by a lighthouse-like Massachusetts Veterans War Memorial Tower. A network of hiking trails traverse the mountain, including the Appalachian Trail. Mount Greylock State Reservation was created in 1898 as Massachusetts' first public land for the purpose of forest preservation.