Wikipedia
The known parts of Kaminaljuyu lie on a broad plain beneath roughly the western third of modern Guatemala City. The Valley of Guatemala is surrounded by hills which culminate in a string of lofty volcanoes to the south. At an altitude of about 2000 m (7000 feet) above sea level, the climate is temperate. Soils are rich because of frequent volcanic eruptions; volcanic ash in the form of hardened tuff reaches depths of several hundred meters in and around Kaminaljuyu, and deep clefts or barrancas mark the landscape.
The Kaminaljuyu site largely was swallowed up by real estate developments in the late 20th century, although a portion of the Classic period center of Kaminaljuyu is preserved as a park. The distinctly unimpressive character of the extant remains is due not only to the location of the ancient city beneath a rapidly expanding Developing World capital city but also because the ancient architecture was constructed of hardened adobe, more perishable than the limestone used to build the cities in the Maya Lowlands. Because of these factors, the true size and scale of Kaminaljuyu likely will never be known.
The state of destruction and the almost daily erasure of archaeological context underscore the many mysteries, in addition to size and scale, that likely will remain unanswered about Kaminaljuyu. Principally these questions are posed about the role of the city as the greatest of the Southern Maya area (SMA) in Preclassic times, particularly during the "Miraflores" period, c. 400–100 BC; the SMA is long believed from much and diverse evidence to have been seminal in the development of Maya civilization.