Geography of Peru
Peru combines the Pacific coast, Andean highlands, and the Amazon region in one country. This results in extreme contrasts in climate, altitude, soil, water balance, and habitats.
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Location and Borders
The Pacific Ocean forms the western border, while the national borders to the north and east run with Ecuador, Colombia, and Brazil. To the southeast lies Bolivia, and to the south, Chile. The location between the coast and the Andes dictates many everyday issues, such as water availability, agriculture, settlement areas, and transport routes.
The north-south extension also creates significant differences in sun exposure, seasonal patterns, and regional precipitation. High mountains and deep valleys act as natural barriers, directing air masses and cloud formation.
For a general introduction, the Peru Overview is also suitable. Climatic details can be found on the Climate in Peru page.
Costa, Sierra, Selva
The classical division describes three major regions that stretch like long strips from north to south. The Costa lies on the Pacific, the Sierra encompasses the Andes, and the Selva extends into the Amazon basin.
Costa
The Costa is narrow, often dry, and characterized by desert areas. Rivers from the Andes create fertile valleys where agriculture, cities, and industry are concentrated.
Sierra
The Sierra encompasses high mountains, plateaus, and deeply incised valleys. Large altitude differences create small-scale climate zones that sometimes change within a few kilometers.
Selva
The Selva is predominantly warm and humid. Rainforests, river landscapes, and floodplains form vast habitats with very high biodiversity.
The Andes in Peru
A mighty section of the Andes traverses Peru from north to south. Snow-capped peaks, glacial lakes, volcanic cones in the south, and fertile highland basins characterize the landscape.
Raw materials such as copper, zinc, and gold play an important economic role in many Andean regions. At the same time, mining, water demand, and nature conservation frequently create conflicts of use.
The Andes also shape many historical sites. Machu Picchu, Sacsayhuamán, and Ollantaytambo are particularly well-known.
Costa: Coast, Desert, River Oases
The Costa appears contradictory at first glance: a long Pacific coast, but in many places very little rain. A central cause lies in cold ocean currents off the coast, which cool the air and inhibit precipitation formation.
Rivers that originate in the Andes and flow to the coast are of great importance. Along these rivers lie the most important agricultural areas of the Costa, often with irrigation.
Typical Landscapes of the Costa
Deserts
Deserts and gravel plains with very sparse vegetation.
River Valleys
River valleys as green islands with intensive agriculture.
Coastal Hills
Coastal hills with seasonal fog zones.
Sierra: Highlands, Valleys, Altiplano
The Sierra consists of mountain ranges, plateaus, and basin landscapes. Many valleys have mild microclimates and allow for diverse forms of cultivation, while higher altitudes are more characterized by pastoral farming and robust crops.
The daily rhythm often follows a clear logic: strong solar radiation during the day, rapid cooling in the evening. Even short distances can mean long travel times due to passes and gorges.
The South and the Altiplano
In the south lies the Altiplano with high elevations and vast plains. A prominent feature is Lake Titicaca on the border with Bolivia.
Selva: Amazon Region and Biodiversity
The Selva occupies a large part of the country and is one of the most biodiverse regions on Earth. Rainforests, rivers, tributaries, oxbow lakes, and seasonally flooded forests create a dense mosaic of habitats.
Its importance extends far beyond Peru, as water balance, carbon storage, and regional weather processes are strongly linked to large forest areas. Pressure arises from infrastructure, illegal logging, mining, and oil spills.
Rivers and Water Systems
Peru's water generally follows three drainage directions: towards the Pacific coast, into the Amazon basin, and into enclosed highland basins. The largest portion of the area drains towards the Atlantic via the Amazon system.
Amazon System in Peru
Several Peruvian rivers form the headwater system of the Amazon. The Ucayali plays an important role as the headwater, fed by large Andean rivers.
Rivers of the Costa
Many coastal rivers carry strongly fluctuating amounts of water seasonally. High demand is created by cities and irrigated agriculture.
Climate by Region
Peru's climate is heavily dependent on altitude, proximity to the sea, and exposure. Three simple guidelines help with classification: dryness on the coast, altitude zones in the Andes, warmth and humidity in the Amazon region.
Costa
- Very low rainfall in many sections
- Frequent fog, especially near the coast
- Strong dependence on Andean water for agriculture
Sierra
- Temperature decrease with increasing altitude
- Large differences between sun-facing and shaded slopes
- Rainy seasons and dry seasons vary by region
Selva
- High humidity and frequent precipitation
- Rivers as central transport and life arteries
- Seasonal flood periods in many lowland areas
Natural Highlights
Lake Titicaca
Lake Titicaca is located at an altitude of approximately 3,810 meters and is one of the world's highest navigable lakes for large vessels.
Nazca Lines
The Nazca Lines are located in a very dry coastal desert and consist of large-scale geoglyphs.
Colca Canyon
The Colca Canyon in the Arequipa region is one of the deep canyon systems of the Andes. Large altitude differences, terraced fields, and condor observation points make the valley famous.
Huascarán and the Cordillera Blanca
Huascarán, at 6,768 meters, is the highest point in Peru. Glaciers, lagoons, and steep ridges characterize the Cordillera Blanca.
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View ForeverFigFAQ about the Geography of Peru
Which three major regions best describe the geography of Peru
The division into Costa, Sierra and Selva describes the coast, Andean highlands and Amazon region. Many climatic and landscape features can be quickly classified using this division.
Why is the coast of Peru often so dry
A cold ocean current off the coast cools the air. Fog often forms, while heavy rain clouds become rarer. In addition, the rain shadow of the Andes further inland causes additional dryness.
Where does the Amazon begin in Peru
The confluence of the Ucayali and Marañón rivers near Iquitos is often considered the beginning of the Amazon. The question of the most distant source remains open depending on the measurement method and definition.
What role do rivers play on the coast
Rivers from the Andes create fertile valleys in an otherwise dry zone. Agriculture, urban growth and industry there depend heavily on water flow and irrigation.
How high is Lake Titicaca
The water surface is at about 3,810 meters. The altitude influences temperature, oxygen content of the air and daily adaptation.
Which natural highlights are suitable for an initial orientation
A good basic selection includes Lake Titicaca, Nazca Lines, Colca Canyon, and the Cordillera Blanca with Huascarán.
Sources
- CIA The World Factbook, Peru, archived data on area, borders and coastline length, 2022 to 2023 edition
- Encyclopaedia Britannica, Peru, overview of Costa, Sierra and Amazonia
- Encyclopaedia Britannica, Amazon River and Ucayali River, information on headwaters and the length question
- UNESCO World Heritage Centre, Lines and Geoglyphs of Nasca and Palpa
- Encyclopaedia Britannica, Lake Titicaca, altitude and significance as a navigable high mountain lake
- UNESCO World Heritage Centre, Huascarán National Park, altitude of Huascarán
- Reuters and Associated Press, reports on the protected zone around the Nazca Lines, June 2025