Paranal Observatory is an astronomical observatory located on Cerro Paranal at 2,635 m (8,645 ft) altitude, 120 km (70 mi) south of Antofagasta, Chile, and operated by the European Southern Observatory (ESO). The Very Large Telescope (VLT), the largest telescope on Paranal, is composed of four separate 8.2 m (320 in) telescopes. In addition, the four main telescopes can combine their light to make a fifth instrument, the Very Large Telescope Interferometer (VLTI).