134 USA - Grand Canyon National Park (UNESCO)

Grand Canyon National Park was created on 26 February 1919 by an act of Congress. First protected in 1893 as a forest reserve in which mining, lumbering and hunting continued to be allowed: upgraded to a game reserve in 1906, giving protection to the wildlife: redesignated a National Monument in 1908. The park is dominated by the spectacular Grand Canyon: a twisting, 1.5 km deep and 445.8 km long gorge, formed during some 6 million years of geological activity and erosion by the Colorado River on the raised Earth's crust (2.5 km above sea level). It divides the park into the North Rim and South Rim which overlook the 200 m to 30 km wide canyon; the buttes, spires, mesas and temples in the canyon are in fact mountains looked down upon from the rims. Ongoing erosion by the seasonal and permanent rivers produces impressive waterfalls and rapids of washed-down boulders along the length of the canyon and its tributaries. Exposed horizontal geological strata in the canyon span some 2,000 million years of geological history, providing evidence of the four major geological eras, early and late Precambrian, Palaeozoic, Mesozoic and Cenozoic. The early Precambrian strata, known as the Vishnu Schist formation, are devoid of fossils. The first fossil evidence appears in the late Precambrian Bass Limestone with remains of early plant forms. Subsequent strata dating from the Palaeozoic era catalogue the sequence of local history, with both marine and terrestrial fossils demonstrating the periods in the distant past when the whole region was alternately submerged and raised. The Mesozoic era is less well illustrated within the park, but tracks made by early reptiles are found to the east in the Navajo Indian reservation. They are a few fossil remains of mammals from the early Cenozoic.

Altitudinal range provides a variety of climates and habitats, ranging from desert to mountain conditions. The canyon is a vast biological museum stretching through five different life and vegetation zones: Hudsonian on the North Rim plateau with Colorado blue spruce and Rocky Mountain maple; Canadian near the North Rim, with aspen and Ponderosa and forests of Douglas fir, white fir and aspen at 2,500 m; high-altitude Transition (Ponderosa) forests ofPinus ponderosa and gambel oak; upper Sonoran on and below the South Rim with Utah juniper, pinon pine and sagebrush; and the Lower Sonoran down the canyon and at the bottom (desert cacti, rabbitbrush, mesquite, Morman tea and Manzanita). Over 1,000 plant species have so far been identified from the park. There are 11 plant species listed as threatened in the United States statutes in the park, including Palmer amsonia, goldenweed, plains cactus, scouler catchfly, wild buckwheats, primrose and clute penstemon. In addition, 15 plant species are recommended for consideration as threatened species under the Endangered Species Act. Concerning the fauna, 76 mammal, 299 bird and 41 reptile and amphibian species have been identified from the park and some 16 fish species inhabit the Colorado River and its tributaries. Rare or threatened birds are listed under the United States Endangered Species Act of 1973. The park contains more than 2,600 documented prehistoric ruins, including evidence of Archaic cultures (the earliest known inhabitants), Cohonina Indians along the South Rim, and Anasazi Indians on both the South Rim, North Rim, and within the Inner Canyon. Hualapai and Havasupai Indians moved into the canyons at this time, where they remained undisturbed until the Anglo-Americans arrived in 1860. Archaeological remains show the adaptation of human societies to severe climate and physiographic environment.

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Arnold Postcrossing (direct swap) sent from Bellaire (USA-Texas) on 23.12.2014

078 SPAIN - Gran Canaria

Gran Canaria is the second most populous island of the Canary Islands, a Spanish archipelago, with a population of 838,397 which constitutes approximately 40% of the population of the archipelago. Located in the Atlantic Ocean about 150 kilometers (~93 miles) off the northwestern coast of Africa and about 1350 km (~838 miles) from Europe. Gran Canaria was populated by the Canarii (Guanches), who may have arrived as early as 500 BC. The Canarii called the island Tamarán or Land of the Brave. After over a century of European (French, Portuguese...) incursions and attempts at conquest, the island was conquered on April 29, 1483, after a campaign that lasted 5 years, by the Kingdom of Castile, with the support of Queen Isabella I, a conquest which turned out to be an important step towards the expansion of the unified Spain. The capital city of Las Palmas was founded on June 24, 1478, under the name "Real de Las Palmas", by Juan Rejón, head of the invading Castilian army. In 1492, Christopher Columbus anchored in the Port of Las Palmas (and spent some time on the island) on his first trip to the Americas. Las Palmas is, jointly with Santa Cruz de Tenerife, the capital of the autonomous community of the Canary Islands.

Gran Canaria is noted for its rich variety of micro climates. Generally speaking though, the average daytime high ranges from 20°C in winter, to 26°C in summer. Some cool nights occur in winter, but lows below 10°C are unknown near the coast. Inland the climate is still mild but mountainous areas see the occasional frost or snow. Annual rainfall averages 228 mm, most of this falling in the cooler months, with July, August and September normally rainless. Rainfall is unevenly distributed through the island with some areas being much drier than others. Cloud cover and sunshine is often quite variable during the cooler months, and there can be several rather cloudy days at times in winter. Summers are generally quite sunny however, with the south of the island being most favoured.

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This postcard was sent by my grandparents from Gran Canaria

067 ALGERIA - Tassili n'Ajjer (WHS)

Tassili, a mountainous region in the centre of the Sahara, situated to the south-east of the Algerian Sahara and bordered by the Libyan Arab Jamahiriya, Niger and Mali, is a strange lunar landscape of deep gorges, dry river beds and 'stone forests'. During the prehistoric period Tassili benefited from climatic conditions which were more favourable to human occupation. The abundance of game, the possibilities of animal husbandry and of pastoral life which lay within immediate proximity of impregnable defensive sites constituted the basic factors which favoured population development. The unique rock formations and networks of steep-sided valleys of the plateau are a result of the alternation of wet and dry periods. At the end of the Upper Pleistocene, for example, there were huge lakes in the region, in what are today the great Ergs. The lakes were fed by rivers flowing down the Tassili, and dry river beds remain from this period. The action of the rivers on the surface of the plateau formed deep gorges and separate plateaux. Over the last 10,000 years the area has become steadily drier, although this process was reversed by a more humid period from 4000 BC to 2000 BC. Wind erosion during dryer periods has formed rock formations which resemble ruins, known as 'stone forests'. The plants and animals found on the plateau bear witness to former wetter periods. Relict species surviving in wet microclimates include fish and shrimp and, until the 1940s, a dwarf Saharan crocodile, many thousands of kilometres from the nearest population in Egypt.

From about 6000 BC to the early centuries of the Christian era, the various peoples who inhabited this plateau left numerous traces in the archaeological record: settlements, tumuli and enclosures that have yielded abundant ceramic material. However, Tassili owes its world renown to the paintings and the rock engravings of all kinds found since 1933. This art covers several periods, each of which corresponds to a particular fauna, yet each can equally be characterized by stylistic differences, without reference to an ecosystem. Five different periods can be identified: the naturalistic period, in which the fauna of the savannah is depicted; the archaic period, when small schematic figures or colossal forms assume the aspects of pictograms charged with an evident magical significance; the Bovidian period (4000-1500 BC), the dominant period in terms of the number of paintings, during which the representation of bovine herds and the scenes of daily life, incorporating a renewed naturalistic aesthetic, are among the best known examples of prehistoric mural art; the Equidian period, covering the end of the Neolithic and protohistoric periods, which corresponds to the disappearance of numerous species from the effects of progressive desiccation and to the appearance of the horse; and the Cameline period, during the first centuries of the Christian era, coinciding with the onset of the hyper-arid desert climate and with the appearance of the dromedary. This site has one of the most important groups of prehistoric cave art in the world. The most important group of paintings is situated to the east of Djanet in the National Park; other remarkable works of rock art are located to the north, in the region of the Wadi Djerat near Illizi.

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Khaled Stamps (direct swap) sent from Annaba (Algeria) on 04.11.2013 

020 ISRAEL - Masada (WHS)

Masada is an ancient fortification in the Southern District of Israel, on top of an isolated rock plateau (akin to a mesa) on the eastern edge of the Judaean Desert, overlooking the Dead Sea. Herod the Great built palaces for himself on the mountain and fortified Masada between 37 and 31 BC. The Siege of Masada by troops of the Roman Empire towards the end of the First Jewish-Roman War ended in the mass suicide of the 960 Jewish rebels and their families hiding there.

The cliffs on the east edge are about 1,300 feet (400m) high and the cliffs on the west are about 300 feet (91m) high; the natural approaches to the cliff top are very difficult. The top of the plateau is flat and rhomboid-shaped, about 1,800 ft (550m) by 900 ft (270m). There was a casemate wall around the top of the plateau totaling 4,300 feet (1.3km) long and 12 feet (3.7m) high with many towers and the fortress included storehouses, barracks, an armory, the palace and cisterns that were refilled by rainwater. Three narrow, winding paths led from below up to fortified gates.

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Christina Pinchuk-Olebu (direct swap) sent from Holon (Israel) on 30.08.2013