Geography of Panama

Continent	Americas
Region	Central America
Coordinates	9°00′N80°00′W / 9.000°N 80.000°W /9.000; -80.000
Area	Ranked 116th
• Total	75,417 km2 (29,119 sq mi)
• Land	98.57%
• Water	1.43%
Coastline	2,490 km (1,550 mi)
Borders	Total border: 555 km (345 mi)
Highest point	Volcán Barú 3,475 metres (11,401 ft)
Lowest point	Pacific Ocean 0 metres (0 ft)
Longest river	Chucunaque River 231 km (144 mi)
Largest lake	Gatun Lake 425 km2 (164 sq mi)
Exclusive economic zone	335,646 km2 (129,594 sq mi)

Panama is a country located inCentral America, bordering both theCaribbean Sea and thePacific Ocean, betweenColombia andCosta Rica. Panama is located on the narrow and lowIsthmus of Panama.

This S-shaped isthmus is situated between 7° and 10° northlatitude and 77° and 83° westlongitude. Panama encompasses approximately 75,417 km² (29,119 sq mi). It is 772 km (480 mi) long, and between 60 and 177 kilometers (37 and 110 miles) wide.

The Cocos and Nazca plates formed in theMiocene. The Panama microplate is made ofoceanic crustbasalt, similar to thebasalt plateau at the bottom of theCaribbean Sea. Theisthmus of Panama formed due toconvergent tectonics of theeastern Pacificsubduction zone, which created amagmatic arc extending from southernNorth America.

The center of the isthmus, fromArenal Volcano inCosta Rica toEl Valle volcano in Panama wasuplifted during the subduction of the unusually thickCocos Ridge oceanic crust, which also produced the four kilometer highTalamanca Range. The western edge of the Caribbean Plate—theCentral American Volcanic Arc—also collided in theNeogene and was compressed as theSouth American Plate moved northward. The El Valle volcano is the easternmoststratovolcano inCentral America.Dacite andandesite flows from five to 10 million years ago are the oldest rocks, followed by a period of quiet 3.4 million years ago and newer dacitedomes andpyroclastic flows between 900,000 and 200,000 years ago. The volcano was the result of crust subduction.^[1]

The combination of these forces produced the Isthmus of Panama and resulted in differentsea surfacesalinity between thePacific andAtlantic since 4.2 million years ago.^[2] It also resulted inmassive interchange of species between North andSouth America and brought global changes inclimate andocean circulation.TheBocas del Toro Archipelago on the western Caribbean coast records localstratigraphy through this period, withPliocene toPleistocenecoral reefcarbonates overlying Miocene basalt andsiliclasticshale.^[3]

In the remote southeasternDarién Province,crystallinebasement rock of theSan Blas Complex formsmassifs in the northeast and southwest, dating to theCretaceous,Paleocene andEocene. These rocks and others in the north such asrhyolite,dacite,basaltic andesite,granodiorite andquartzdiorite indicate that the region was a separate magmatic arc until 20 million years ago. In the south, pre-collision basement rocks includeradiolarianchert,pillow basalt anddiabase. Complexfaulting and folding formed theChucunaque-TuiraBasin which includes three kilometers ofsediments from the Miocene deposited during the collision with South America.^[4]

Offshore ofColombia and western Panama, the Panama Basin formed between 27 and eight million years ago due toasymmetricseafloor spreading between the Nazca and Cocos plates. The Mapelorift and the Yaquinagraben in the eastern basin are remnants ofold and now inactive spreading centers. Between 22 and 20 million years ago,hotspotvolcanism generated theCarnegie, Cocos andMalpelo ridges.^[5]

The dominant feature of Panama's landform is the central spine of mountains and hills that forms the continental divide. The divide does not form part of the great mountain chains of North America, and only near the Colombian border are there highlands related to theAndean system of South America. The spine that forms the divide is the highly eroded arch of an uplift from the sea bottom, in which peaks were formed by volcanic intrusions.

The western portion of the spine, the Cordillera Central, extends from Costa Rica to a low saddle near the Panama Canal. Within the Cordillera Central are three ranges. The loftyCordillera de Talamanca extends east from Costa Rica and contains Panama's highest peak,Volcán Barú, at 3,475 meters (11,401 ft). Volcán Barú (or Volcán de Chiriquí) last erupted in 1550^[6] and is the apex of a highland that includes Panama's richest soil. Further east are the lower Serranía de Tabasará and Sierra de Veraguas ranges, the latter extending towards the Panama Canal.

Panama has a tropical climate. Temperatures are uniformly high—as is the relative humidity—and there is little seasonal variation. Diurnal ranges are low; on a typical dry-season day in the capital city, the early morning minimum may be 24 °C (75.2 °F) and the afternoon maximum 29 °C (84.2 °F). The temperature seldom exceeds 32 °C (89.6 °F) for more than a short time.

Temperatures on the Pacific side of the isthmus are somewhat lower than on the Caribbean, and breezes tend to rise after dusk in most parts of the country. Temperatures are markedly cooler in the higher parts of the mountain ranges, and frosts occur in the Cordillera de Talamanca in western Panama, with pipes having been frozen at as low as 7,000 ft (2,100 m) elevation.^[7]

Climatic regions are determined less on the basis of temperature than on rainfall, which varies regionally from less than 1,300 millimeters (51.2 in) to more than 3,000 millimeters (118.1 in) per year. Almost all of the rain falls during the rainy season, which is usually from May through November, but varies in length from seven to nine months, with certain exception due tomonsoons. The cycle of rainfall is determined primarily by two factors: moisture from the Caribbean, which is transported by north and northeast winds prevailing during most of the year, and the continental divide, which acts as a rain shield for the Pacific lowlands. Panama lies outside theMain Development Region fortropical cyclone activity.

A third influence that is present during the late autumn is the southwest wind off the Pacific. This wind brings some precipitation to the Pacific lowlands, modified by the highlands of thePenínsula de Azuero, which form a partial rainshield for much of central Panama. Rainfall is generally much heavier on the Caribbean than on the Pacific side. The annual average in Panama City is little more than half of that in Colón.

Pacific Coast

Caribbean coast

Interior lowlands

Highlands

Panama's tropical environment supports an abundance of plants. Forests dominate, interrupted in places by grasslands, scrub, and crops. Nearly 40 percent of Panama is wooded. Deforestation is a continuing threat to the rain-drenched woodlands. Tree cover has been reduced by more than 50 percent since the 1940s.

Subsistence farming, widely practiced from the northeastern jungles to the southwestern grasslands, consists largely of corn, bean, and tuber plots.Mangrove swamps occur along parts of both coasts, withbanana plantations occupying deltas near Costa Rica. In many places, a multi-canopied rain forest abuts the swamp on one side of Panama and increases to the lower reaches of slopes in the other.

The Caribbean coastline is marked by several good natural harbors. The numerous islands of the Archipiélago de Bocas del Toro, near the Beaches of Costa Rica, provide an extensive natural roadstead and shield the banana port ofAlmirante. The over 350San Blas Islands, near Colombia, are strung out for more than 160 km (99 mi) along the sheltered Caribbean coastline.

The major port on the Pacific coastline isBalboa. The principal islands are those of theArchipiélago de las Perlas in the middle of theGulf of Panama, the penal colony on theIsla de Coiba in the Golfo de Chiriquí, and the decorative island ofTaboga, a tourist attraction that can be seen from Panama City. In all, there are some 1,000 islands off the Pacific coast.

The Pacific coastal waters are extraordinarily shallow. Depths of 180 metres (591 ft) are reached only outside the perimeters of both the Gulf of Panama and the Golfo de Chiriquí, and wide mud flats extend up to 70 km (43 mi) seaward from the coastlines. As a consequence, the tidal range is extreme. A variation of about 70 centimetres (2.3 ft) between high and low water on the Caribbean coast contrasts sharply with over 700 cm (23 ft) on the Pacific coast, and some 130 km (81 mi) up the Río Tuira, the tidal range is still over 500 cm (16 ft). A recent global remote sensing analysis suggested that there were 1,016 km² of tidal flats in Panama, making it the 32nd ranked country in terms of tidal flat area.^[18]

Nearly 500 rivers lace Panama's rugged landscape. Mostly unnavigable, many originate as swift highland streams, meander in valleys, and form coastal deltas. The Río Chepo and theRío Chagres are sources of hydroelectric power. The Kampia lake and Madden Lake (also filled with water from the Río Chagres) provide hydroelectricity for the area of the former Canal Zone.

More than 300 rivers empty into the Pacific. These Pacific-oriented rivers are longer and slower running than those of the Caribbean side. Their basins are also more extensive. One of the longest is theRío Tuira which flows into theGolfo de San Miguel and is the nation's only river navigable by larger vessels.

Panama is divided into 10 provinces, plus several indigenouscomarcas. The provinces are divided into districts, which in turn are subdivided into sections called corregimientos. Configurations of the corregimientos are changed periodically to accommodate population changes as revealed in the census reports.

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Geographic coordinates:9°00′N80°00′W / 9.000°N 80.000°W /9.000; -80.000

Map references:Northern South America, theCaribbean and sometimes Central America

Area:
total:75,420 km²
land:74,340 km²
water:1,080 km²

Land boundaries:
total:555 km
border countries:Colombia 225 km, Costa Rica 330 km

Coastline:2,490 km

Maritime claims:
territorial sea:12 nautical miles (22 kilometres)
contiguous zone:24 nautical miles (44 kilometres)
exclusive economic zone:335,646 km² (129,594 sq mi) and 200 nautical miles (370 kilometres) or edge of continental margin

Climate:tropical maritime; hot, humid, cloudy; prolonged rainy season (May to January), short dry season (January to May)

Terrain:interior mostly steep, rugged mountains and dissected, upland plains; coastal areas largely plains and rolling hills

Extreme points:

Northernmost point: Point Manzanillo

Southernmost point:Punta Mariato,Cerro Hoya National Park,Veraguas

Westernmost point: Border withCosta Rica,Chiriquí Province

Easternmost point: Border withColombia,Darién Province
Lowest point: Pacific Ocean 0 m
Highest point:Volcan de Chiriqui 3,475 m

Natural resources:copper,mahogany forests,shrimp,hydropower

Land use:
arable land:7.16%
permanent crops:2.51%
other:90.33% (2011)

Irrigated land:346.2 km² (2003)

Total renewable water resources:148 km³ (2011)

Natural hazards:occasional severe storms and forest fires in the Darien area, earthquakes

Environment - current issues:water pollution from agricultural runoff threatens fishery resources;deforestation of tropicalrain forest;land degradation andsoil erosion threatens siltation ofPanama Canal; air pollution in urban areas; mining threatens natural resources

Environment - international agreements:
party to:Biodiversity,Climate Change,Climate Change-Kyoto Protocol,Desertification,Endangered Species,Environmental Modification,Hazardous Wastes,Law of the Sea,Marine Dumping,Ozone Layer Protection,Ship Pollution,Tropical Timber 83,Tropical Timber 94,Wetlands,Whaling
signed, but not ratified:Marine Life Conservation

Geography - note:strategic location at eastern end of Central America; controls Panama Canal that links Atlantic Ocean via Caribbean Sea with Pacific Ocean. Central Panama has the unusual distinction of having the sun rise over the Pacific and set over the Atlantic.

• This article incorporates text from this source, which is in thepublic domain. Country Studies.Federal Research Division.
•  This article incorporatespublic domain material fromThe World Factbook.CIA.

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