The Sudans Nile within the Sudans has no significant tributaries. The amount of rainfall increases towards the south. In the north there is the very dry Nubian Desert; in the south there are swamps and rainforest. The Sudans’s rainy season lasts for about three months (July to September) in the north, and up to six months (June to November) in the south. The dry regions are plagued by sandstorms, known as haboob, which can completely block out the sun. In the northern and western semi-desert areas, people rely on the scant rainfall for basic agriculture and many are nomadic, travelling with their
Sonoran Desert Altar, with the "Reserva de la Biosfera el Pinacate y Gran Desierto de Altar" ('Pinacate National Park' in Mexico), extending of desert and mountainous regions. The Pinacate National Park includes the only active Erg dune region in North America. The nearest city to the "Reserva de la Biosfera el Pinacate y Gran Desierto de Altar" is Puerto Peñasco (a.k.a. 'Rocky Point') in the state of Sonora, Mexico. Sonoran Desert sub-regions include: The Sonoran Desert includes 60 mammal species, 350 bird species, 20 amphibian species, over 100 reptile species, 30 native fish species, over 1000 native bee species, and more than