Valley of Ten Thousand Smokes The ash-filled valley covers a area. The ash can be up to deep. In places deep canyons have been cut by the River Lethe, allowing observers to see the ash flow strata. Since the ash has cooled, most of the fumaroles are now extinct and despite its name the valley is no longer filled with 'smoke' (i.e. steam). Vegetation still does not grow in the valley. The signs of volcanic activity are still visible on nearby hills. Katmai's most recent eruption was in 1927, but there have been non-eruptive events as recent as 2003. The Alaska Volcano Observatory still monitors
The Metropolitan Area of the Aburrá Valley the 10 cities and municipalities part of this metropolitan area is close to 4 million inhabitants. The development of the Aburra Valley occurred in the 1930s after a rapid population growth that produced a conurbation of Medellín, Itagüí, Envigado and Bello. Medellín, as the capital of the Antioquia Department, main economic center and host of most of local government entities contributed to a rapid urban development which absorbed many corregimientos such as Robledo, La América, La Floresta, Guayabal and Belén, among others. With the industrialization the middle and higher class moved to the southern parts of the city like El