Madrid economic, cultural, industrial, educational, and technological centre on the European continent. Madrid lies on the southern Meseta Central, 60 km south of the Guadarrama mountain range and straddling the Jarama and Manzanares river sub-drainage basins, in the wider Tagus River catchment area. There is a considerable difference in altitude within city limits ranging from in the Manzanares riverbanks in the southeast of the municipality to above sea level in the highest part of the Fuencarral-El Pardo district. Over a quarter of the Madrid municipal area is covered by the largely forested protected area of El Pardo. Madrid has an inland
Allison Engine Testing Stands section. The most prominent features of the six open engine testing stands constructed in 1942 are the six reinforced concrete walls which separated the testing stands and provided a degree of protection against excessive noise or a propeller malfunction. Stands 1 to 4, numbered from the north, have been constructed on a raised concrete platform above ground level. Parts of its flooring have been raised higher above the general level of the platform. They indicate the positions where each engine stand and its respective control cabin would have stood. Most of the remaining evidence of the purpose and working life