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28-557: The Congolian rainforest is the world's second-largest tropical forest , after the Amazon rainforest . It covers over 500,000,000 acres (2,000,000 km) across six countries and contains a quarter of the world's remaining tropical forest. The Congolian forests cover southeastern Cameroon , Gabon , Republic of the Congo , the northern and central Democratic Republic of the Congo , and portions of southern and central Africa. The Congolian rainforest

56-507: A millennium . This wobble means that the Tropic of Cancer is currently drifting southward at a rate of almost half an arcsecond (0.468″) of latitude, or 15 m (49 ft), per year. The circle's position was at exactly 23° 27′N in 1917 and will be at 23° 26'N in 2045. The distance between the Antarctic Circle and the Tropic of Cancer is essentially constant as they move in tandem. This

84-410: A lack of human resources and political interest (thus lack of financial support) are hampering efforts to improve forest land allocation and a Payments for Forest Environmental Services scheme. Tropic of Cancer 23°26′12.5″N 0°0′0″W  /  23.436806°N -0.00000°E  / 23.436806; -0.00000  ( Prime Meridian ) The Tropic of Cancer , also known as

112-456: A portion of them (depending on how they are defined – see maps). The remaining tropical forests are a diversity of many different forest types including: Eucalyptus open forest, tropical coniferous forests , savanna woodland ( e.g. Sahelian forest ), and mountain forests (the higher elevations of which are cloud forests ). Over even relatively short distances, the boundaries between these biomes may be unclear, with ecotones between

140-447: A wide range of disturbances, including more localized pressures such as habitat loss and degradation and anthropogenic climate change . Studies have also shown that ongoing climate change is increasing the frequency and intensity of some climate extremes (e.g. droughts, heatwaves and hurricanes) which, in combination with other local human disturbances, are driving unprecedented negative ecological consequences for tropical forests around

168-564: Is based on an assumption of a constant equator, but the precise location of the equator is not truly fixed. See: equator , axial tilt and circles of latitude for additional details. Download coordinates as: North of the tropic are the subtropics and the North Temperate Zone . The equivalent line of latitude south of the Equator is called the Tropic of Capricorn , and the region between

196-677: Is depleting the rainforests of wildlife. With annual forest loss of 0.3% during the 2000s, the region had the lowest deforestation rate of any major tropical forest zone. From 2015 to 2019, the rate of deforestation in the Democratic Republic of the Congo doubled. In 2021, deforestation of the Congolese rainforest increased by 5%. Over the past 20 years, 17.1 million hectares of forest have been cut down. Tropical forest Tropical forests are forested ecoregions with tropical climates – that is, land areas approximately bounded by

224-473: Is endemic to the northeastern Congolian rainforests. The rainforests have 1,000 native species of birds like the grey parrot , brown nightjar and the bat hawk , and 700 species of fish like the Nile tilapia , Nile perch and the giraffe catfish . Threats to the rainforests include destruction and fragmentation of forests by commercial logging, oil palm plantations, and mining. The bushmeat trade and poaching

252-467: Is home to a large number of flora and fauna, including more than 10,000 species of plants and over 10,000 species of animals. It is estimated that the region contains more than a quarter of the world’s plant species and is home to one of the world’s most threatened primate species, the western lowland gorilla . There are also a number of other species of primates, including the chimpanzee , black colobus monkey , red colobus monkey , and olive baboon . To

280-611: The Equator . Its Southern Hemisphere counterpart, marking the most southerly position at which the Sun can be seen directly overhead, is the Tropic of Capricorn . These tropics are two of the five major circles of latitude that mark maps of Earth, the others being the Arctic and Antarctic circles and the Equator . The positions of these two circles of latitude (relative to the Equator) are dictated by

308-752: The Northern Tropic , is the Earth 's northernmost circle of latitude where the Sun can be seen directly overhead . This occurs on the June solstice , when the Northern Hemisphere is tilted toward the Sun to its maximum extent. It also reaches 90 degrees below the horizon at solar midnight on the December Solstice . Using a continuously updated formula, the circle is currently 23°26′09.8″ (or 23.43605°) north of

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336-512: The old-growth forest had been reduced from 76% to 50% of the island, mostly due to fire and agricultural expansion . A widely-held view is that placing a value on the ecosystem services these forests provide may bring about more sustainable policies. However, clear monitoring and evaluation mechanisms for environmental, social and economic outcomes are needed. For example, a study in Vietnam indicated that poor and inconsistent data combined with

364-454: The tropics of Cancer and Capricorn , but possibly affected by other factors such as prevailing winds . Some tropical forest types are difficult to categorize. While forests in temperate areas are readily categorized on the basis of tree canopy density, such schemes do not work well in tropical forests. There is no single scheme that defines what a forest is, in tropical regions or elsewhere. Because of these difficulties, information on

392-491: The Amazon and Southeast Asian rainforests. However, its plant and animal life is still more rich and varied than most other places on Earth. The Congolian Forests are a global 200 ecoregion . There are over 400 species of mammals in the rainforest, including African forest elephants , African bush elephants , leopards , bongos , red river hogs , chimpanzees , bonobos , mountain gorillas , and lowland gorillas . The okapi

420-456: The Tropic of Cancer experience two distinct seasons: an extremely hot summer with temperatures often reaching 45 °C (113 °F) and a warm winter with maxima around 22 °C (72 °F). Much land on or near the Tropic of Cancer is part of the Sahara Desert , while to the east, the climate is torrid monsoonal with a short wet season from June to September, and very little rainfall for

448-612: The east, the lowland Congolian forests transition to the highland Albertine Rift montane forests , which cover the mountains lining the Albertine Rift , a branch of the East African Rift system. The World Wide Fund for Nature divides the Congolian forests into six distinct ecoregions : The Congolian rainforests are home to over 10,000 species of plants of which 30% are endemic . The Congolian rainforests are less biodiverse than

476-419: The extent of tropical forests varies between sources. However, tropical forests are extensive, making up just under half the world's forests. The tropical domain has the largest proportion of the world's forests (45 percent), followed by the boreal, temperate and subtropical domains. More than 3.6 million hectares of virgin tropical forest was lost in 2018. The original tropical rainforests , which covered

504-496: The fact that the Sun appears to "turn back" at the solstices. The Tropic of Cancer's position is not fixed, but constantly changes because of a slight wobble in the Earth's longitudinal alignment relative to the ecliptic , the plane in which the Earth orbits around the Sun. Earth's axial tilt varies over a 41,000-year period from about 22.1 to 24.5 degrees, and as of 2000 is about 23.4 degrees, which will continue to remain valid for about

532-479: The following 17 countries (including two disputed territories) and 8 water bodies, starting at the prime meridian and heading eastward: The climate at the Tropic of Cancer is generally hot and dry, except for cooler highland regions in China, marine environments such as Hawaii, and easterly coastal areas, where orographic rainfall can be very heavy, in some places reaching 4 metres (160 in) annually. Most regions on

560-525: The main types. The nature of tropical forests in any given area is affected by several factors, most importantly: The Global 200 scheme, promoted by the World Wildlife Fund , classifies three main tropical forest habitat types ( biomes ), grouping together tropical and sub-tropical areas (maps below): Extent of tropical and sub-tropical - A number of tropical forests have been designated High-Biodiversity Wilderness Areas , but remain subject to

588-485: The north, south, and southwest, the forests transition to drier forest-savanna mosaic , a mosaic of drier forests, savannas , and grasslands . To the west, the Congolian forests transition to the coastal Lower Guinean forests , which extend from southwestern Cameroon into southern Nigeria and Benin ; these forest zones share many similarities and are sometimes known as the Lower Guinean-Congolian forests. To

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616-497: The planet's land surface, were the type of flora that covered Earth.Other canopy forests expanded north-south of the equator during the Paleogene epoch, around 40 million years ago, as a result of the emergence of drier, cooler climates. The tropical forest was originally identified as a specific type of biome in 1949. Tropical forests are often thought of as evergreen rainforests and moist forests, but these account for only

644-678: The rest of the year. The highest mountain on or adjacent to the Tropic of Cancer is Yu Shan in Taiwan . It had glaciers descending as low as 2,800 metres (9,190 ft) during the Last Glacial Maximum . At present glaciers still exist around the Tropic. The nearest currently surviving are the Minyong and Baishui in the Himalayas to the north and on Iztaccíhuatl in Mexico to the south. According to

672-488: The rules of the Fédération Aéronautique Internationale , for a flight to compete for a round-the-world speed record, it must cover a distance no less than the length of the Tropic of Cancer, cross all meridians , and end on the same airfield where it started. The length of the Tropic of Cancer is 36,788 km (22,859 mi): For an ordinary circumnavigation the rules are somewhat relaxed and

700-402: The tilt of Earth's axis of rotation relative to the plane of its orbit , and since the tilt changes, the location of these two circles also changes. In geopolitics , it is known for being the southern limitation on the mutual defence obligation of NATO , as member states of NATO are not obligated to come to the defence of territory south of the Tropic of Cancer. When this line of latitude

728-401: The two, centered on the Equator, is the tropics . In the year 2000, more than half of the world's population lived north of the Tropic of Cancer. On the Tropic of Cancer there are approximately 13 hours, 35 minutes of daylight during the summer solstice. During the winter solstice, there are 10 hours, 41 minutes of daylight. Using 23°26'N for the Tropic of Cancer, the tropic passes through

756-616: The world. All tropical forests have experienced at least some levels of disturbance. Current deforestation in the biodiversity hotspots of North of South America, sub-Saharan Africa, South-East Asia and the Pacific, can be attributed to export of commodities such as: beef, soy, coffee, cacao, palm oil , and timber; there is a requirement for "strong transnational efforts ... by improving supply chain transparency [and] public–private engagement". A study in Borneo describes how, between 1973 and 2018,

784-522: Was named in the last centuries BCE , the Sun was in the constellation Cancer ( Latin : Crab ) at the June solstice (90° ecliptic longitude ). Due to the precession of the equinoxes , this is no longer the case; today the Sun is in constellation Taurus at the June solstice. The word "tropic" itself comes from the Greek "trope (τροπή)", meaning turn (change of direction or circumstance), inclination, referring to

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