Atacama Large Millimeter Array (ALMA): Located in the Atacama Desert in northern Chile, ALMA is an array of radio telescopes and is one of the highest observatories in the world. Its operations are conducted at an altitude of about 5,000 meters (16,404 feet) above sea level.
Indian Astronomical Observatory (IAO): Located in Hanle, Ladakh, India, the IAO is one of the highest optical observatories globally, situated at an altitude of around 4,500 meters (14,764 feet) above sea level.
Llano de Chajnantor Observatory: Also situated in the Atacama Desert in Chile, the Llano de Chajnantor Observatory hosts various astronomical facilities, including the Atacama Pathfinder Experiment (APEX) telescope and the future Cherenkov Telescope Array (CTA). It is located at an altitude of around 5,100 meters (16,732 feet) above sea level.
La Rinconada Observatory: Located in the Chilean Andes, La Rinconada Observatory is home to the Cosmic Background Imager (CBI) telescope and other instruments. It is located at an altitude of approximately 5,180 meters (16,995 feet) above sea level.
Qinghai Radio Observatory: Located in Qinghai, China, this observatory houses the world's largest fully steerable radio telescope known as the 50m Radio Telescope. It is situated at an altitude of about 4,250 meters (13,944 feet) above sea level.
