Tenerife is, with its area of , the most extensive island of the Canary Islands. In addition, with 904,713 inhabitants it is the most populated island of the archipelago and Spain. Two of the islands' principal cities are located on it: The capital, Santa Cruz de Tenerife and San Cristóbal de La Laguna (a World Heritage Site). San Cristóbal de La Laguna, the second city of the island is home to the oldest university in the Canary Islands, the University of La Laguna. The Teide, with its is the highest peak of Spain and also a World Heritage Site. Tenerife is the site of the worst air disaster in the history of aviation, in which 583 people were killed in the collision of two Boeing 747s on 27 March 1977.