The James Clerk Maxwell Telescope (JCMT) is the world's largest single-dish radio telescope designed specifically to work at submillimeter wavelengths; it covers wavelengths between 0.3 and 2 millimeters. The 15-meter primary dish is made of 276 aluminum panels, each of which is adjustable to keep the surface accurately configured. The JCMT is located near the summit of Mauna Kea, Hawaii, and used to be operated on behalf of the three partner countries (United Kingdom, Canada, and the Netherlands) by the Joint Astronomy Centre (JAC) in Hilo, Hawaii, which also operates the United Kingdom Infrared Telescope. In March 2015 operation of the JCMT was taken over by the East Asian Observatory.