Abstract
The Observatorio Astronómico Nacional is run and operated by the Instituto de Astronomía of the National Autonomous University of Mexico. It is located in the northern part of México, in the sierra San Pedro Mártir (SPM), in the state of Baja California. At an altitude of 2890 m above sea level, 31 ° north in latitude, flanked by the Pacific Ocean and the gulf of Baja California, SPM has proven to be one of the last pristine spots for a ground-based astronomical observatory in our planet. The IAUNAM is making substantial efforts towards conservation and further development of this excellent astronomical site. Here we present a brief account of its basic characteristics and facilities.
