El Salvador is the smallest country in continental America, covering 21,041 km² on the Pacific side of Central America between Guatemala to the northwest and Honduras to the northeast and east. It measures about 270 km from west to east and 142 km from north to south, and it has roughly 307 km of Pacific coastline but no Caribbean shore. Two parallel mountain lines cross it, the Sierra Madre along the Honduran border and a chain of more than twenty volcanoes nearer the sea, with a central plateau between them and a narrow coastal plain below. The highest point is Cerro El Pital, 2,730 m, in the northern mountains; the lowest is the Pacific Ocean at sea level. The Lempa is the main river, draining about half the country, and its two best-known natural lakes, Ilopango and Coatepeque, fill volcanic calderas. About 6 million people lived here in 2024, most of them on the plateau. Because the Cocos Plate is sliding beneath the Caribbean Plate just offshore, almost every step down from the summit to the shore passes something built by an earthquake or an eruption.
Cerro El Pital, 2,730 Metres on the Honduran Border
The descent starts in Chalatenango Department, about 12 km from the town of La Palma, on the summit of Cerro El Pital. At 2,730 m it is the highest point in Salvadoran territory and the coldest place in the country. The mountain is wrapped in cloud forest with an average annual temperature of about 10 °C. From November to February temperatures range from −6 °C, the lowest ever recorded there in January 1956, up to 10 °C, and on 13 April 2004 a hailstorm left much of the mountain white, an event unusual enough to cause a commotion locally.
The forest on its slopes shelters some of El Salvador's rarest plants and animals, including the resplendent quetzal, and the wide range of altitude packed into a small area gives it unusual biodiversity. It is also one of the most popular natural attractions in the country.
The Sierra Madre and the Montecristo Trifinio Forest
El Pital belongs to the northern range, the Sierra Madre, which forms a continuous chain along the border with Honduras at elevations of roughly 1,600 to 2,700 m. Together with the volcanic chain and the plateau, these interior highlands make up about 85 percent of the country. The northern range was once heavily forested, but overexploitation stripped much of it, and erosion has left large areas semi-barren. It is now the most thinly settled part of El Salvador, with little farming or development.
At the range's western end, where El Salvador, Honduras and Guatemala meet, the Montecristo cloud forest survives. Montecristo National Park, founded in 2008, covers 19.73 km² in the country's northwestern tip, and together with Montecristo Trifinio National Park in Honduras and the Trifinio Biosphere Reserve in Guatemala it forms the Trifinio Fraternidad Transboundary Biosphere Reserve. The tectonics here differ from the rest of the country: north of the border, the North American Plate grinds westward past the Caribbean Plate along a fault that follows Guatemala's Motagua valley, and movement on that fault causes the earthquakes felt in northernmost El Salvador.
Santa Ana Volcano and Izalco, the Lighthouse of the Pacific
South of the Sierra Madre the second mountain line begins: a broken chain of more than twenty volcanoes clustered in five groups. The westernmost group, near the Guatemalan border, holds the tallest. Santa Ana Volcano, also called Ilamatepec, rises to 2,381 m in Santa Ana Department, making it the highest volcano in the country. Its summit holds four nested craters, the innermost containing a small crater lake. Sometime in the late Pleistocene, no more than 57,000 years ago, part of the summit collapsed and sent a debris avalanche all the way to the Pacific, where it built the Acajutla Peninsula. In 1722 lava from the San Marcelino vents on its eastern flank flowed 11 km and destroyed the village of San Juan Tecpan, and an eruption in October 2005 killed at least two people.
On Santa Ana's southern flank stands Izalco. It was born in 1770 and erupted almost continuously until 1958, its glowing cone visible far out at sea, which earned it the name "Lighthouse of the Pacific". An eruption in 1926 buried the village of Matazano and killed 56 people, and a flank eruption followed in 1966. Since then only fumaroles have been active. Visitors climb Izalco from Cerro Verde National Park, and between the cones lie basins of rich volcanic soil where much of the country's coffee grows.
Lake Coatepeque in Its Collapsed Caldera
Immediately east of Santa Ana, the ground falls into the Coatepeque Caldera, the bowl left when a group of volcanoes blew themselves apart in a series of explosive eruptions between about 72,000 and 57,000 years ago. The name comes from Nawat and means "at the snake hill". Basaltic cinder cones and lava flows later formed near its western edge, and six lava domes have grown since, the youngest, Cerro Pacho, after 8000 BC.
Lake Coatepeque fills the eastern part of the caldera. At 26 km² it is one of the largest lakes in El Salvador, with hot springs near its shores and the island of Teopan, once a Maya site of some importance. Every few years the water turns from blue to turquoise; the environment ministry calls this a cyclical phenomenon, and it has been recorded in 1998, 2006, 2012 and each year from 2016 to 2019.
The Lempa River and the Cerrón Grande Reservoir
Water from the northern mountains gathers in the Lempa, the country's main river. It is 422 km long and shared by three countries. It rises near Olopa in southern Guatemala, crosses a corner of Honduras, and enters El Salvador at Citalá in Chalatenango, then flows for about 360 km, cutting first through the northern range, then along the central plateau, and finally through the volcanic chain to reach the Pacific in San Vicente Department. Its basin covers 18,246 km², and 49 percent of El Salvador's territory drains into it; about 77.5 percent of Salvadorans live in towns and villages inside that basin. It is also the only navigable river among the more than 300 in the country.
In the north of the country, the Cerrón Grande Hydroelectric Dam blocks the Lempa. The reservoir behind it filled between 1973 and 1976 and covers 135 km², making it the largest body of fresh water in El Salvador. Locally it is known as Lake Suchitlán, a Nahuatl name coined by the writer Alejandro Cotto that means "place of flowers". Its main inflows are the Lempa and the Acelhuate, and it is among the most polluted freshwater bodies in Central America.
San Salvador Volcano and the Ilopango Caldera on the Central Plateau
Below the volcanic peaks lies the central plateau, about 50 km wide and averaging 600 m, with rolling ground, escarpments and lava fields. It holds the densest population and the largest cities. The capital, San Salvador, has an average temperature of 23 °C, with recorded extremes of 38 °C and 6 °C, and its western districts climb the slopes of the San Salvador Volcano, also known as Quezaltepeque or El Boquerón. Its highest peak, El Picacho, reaches 1,960 m, and it last erupted in 1917. Earthquakes destroyed the city in 1756 and 1854 and caused heavy damage in 1919, 1982 and 1986. The site's article on San Salvador covers the city itself.
Just east of the capital the plateau drops into its deepest hole. Lake Ilopango fills a caldera 8 by 11 km, ringed by a scalloped rim 100 to 500 m high, and at 70.5 km² it is the second-largest lake in the country, overflowing to the Pacific through the Jiboa River. The caldera last collapsed in a huge eruption that radiocarbon dating places between 410 and 535 CE; one team has narrowed it to 431 CE, give or take two years. It threw out an estimated 37 to 82 km³ of material, rated 6 on the Volcanic Explosivity Index, and buried at least 10,000 km² under 50 cm or more of pumice and ash, devastating Maya settlements and probably halting farming in the worst-hit area for decades. Farther east, San Miguel Volcano remains one of the two most active in the country; it erupted on 29 December 2013, forcing thousands to evacuate.
The Pacific Lowlands From La Libertad to Jiquilisco Bay
The last step down is the Pacific lowland, a strip of alluvial plain between 1 and 32 km wide. Near La Libertad the volcanoes crowd so close that their slopes run straight into the ocean; farther east the plain broadens. This is the hottest part of El Salvador, with annual averages of 25 to 29 °C. The rainy season, which Salvadorans call invierno, runs from May to October and can bring up to 2,000 mm to south-facing slopes, while the dry verano from November to April arrives when northeast trade winds have already dropped their moisture over Honduras.
East of the Lempa's mouth, in Usulután Department, Jiquilisco Bay holds the largest mangrove estuary in the country. The reserve covers about 400 km², including 50 km of coast, and stretches from the Lempa to the Jucuarán hills; its main channel is more than 43 km long and 3 km wide. It was declared a Ramsar wetland of international importance on 31 October 2005 and hosts more than 80 species of migratory birds, which feed on the bay's snook, red snapper and corvina.
Sea Level in the Gulf of Fonseca
The descent ends at sea level in the far southeast, where La Unión Department faces the Gulf of Fonseca. The gulf is shared by El Salvador, Honduras and Nicaragua, and the coastal plain is at its widest beside it. Gil González de Ávila was the first European to reach it, in 1522, naming it after his patron, Archbishop Juan Fonseca. Its waters have been argued over for more than a century: in 1917 the Central American Court of Justice sided with El Salvador, which argued that Nicaragua's grant of part of the bay to the United States for a naval base violated its rights to the gulf, though the United States ignored the decision. In 1992 a chamber of the International Court of Justice ruled that the three countries share control of the gulf, awarding the islands of Meanguera and Meanguerita to El Salvador and El Tigre to Honduras. The country's easternmost point is the island of Meanguera del Golfo, inside the gulf. The regional setting of this descent, from cold cloud forest to warm tidal water, is laid out in the site's overview of Central American geography.