At a glance
- Official name: Republic of Peru
- Location: Western South America, Pacific coast
- Area: 1,285,216 square kilometers
- Borders: Ecuador, Colombia, Brazil, Bolivia, Chile
- Coastline length: 2,414 kilometers
- Capital city: Lima
- Major areas: Costa, Sierra, Selva
- Highest peak: Huascarán, 6,768 meters
- As of January 2026
Location and boundaries
The Pacific Ocean forms the western border, while the country's northern and eastern borders are with Ecuador, Colombia, and Brazil. Bolivia lies to the southeast, and Chile to the south. Its location between the coast and the Andes Mountains determines many aspects of daily life, such as water availability, agriculture, settlement patterns, and transportation routes.
The north-south extent also creates large differences in the sun's position, seasonal patterns, and regional precipitation. High mountains and deep valleys act as natural barriers, directing air masses and cloud formation.
Costa, Sierra, Selva
The classic division describes three major regions that stretch like long strips from north to south. The Costa lies along the Pacific coast, the Sierra encompasses the Andes, and the Selva extends into the Amazon basin. Many travel itineraries, economic regions, and natural landscapes can be particularly well explained using this tripartite division.
Costa
The coast 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 differences in altitude create diverse climate zones that sometimes change within just a few kilometers.
Selva
The Selva is predominantly warm and humid. Rainforest, river landscapes, and floodplains form vast habitats with very high biodiversity.
The Andes in Peru
A mighty section of the Andes Mountains runs through Peru from north to south. Snow-capped peaks, glacial lakes, volcanic cones in the south, and fertile highland basins characterize the landscape. The altitude ranges from sea level to almost 7,000 meters, which significantly influences agriculture, construction methods, and daily life.
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 often lead to conflicts of use, which vary greatly from region to region.
Costa: Coast, desert, river oases
At first glance, the Costa del Sol seems contradictory: a long Pacific coastline, yet in many places very little rain. A key reason lies in cold ocean currents off the coast, which cool the air and inhibit precipitation. The frequent result is fog and mist, while measurable rain is absent.
Rivers originating in the Andes and flowing to the coast are of great importance. The main agricultural areas of the Costa, often irrigated, lie along these rivers. Cities, ports, and transport routes are also concentrated in these corridors.
Typical landscapes of the Costa
- Deserts and gravel plains with very sparse vegetation
- River valleys as green islands with intensive agriculture
- Coastal hills with seasonal fog zones
Sierra: Highlands, valleys, Altiplano
The Sierra consists of mountain ranges, plateaus, and basins. Many valleys have mild microclimates and allow for diverse forms of agriculture, while higher elevations are characterized by pastoral farming and robust crops.
The daily rhythm often follows a clear logic: strong sunshine during the day, rapid cooling in the evening. Even short distances can mean long travel times due to mountain passes and gorges.
The South and the Altiplano
To the south lies the Altiplano, with its high altitudes and vast plains. A striking feature is Lake Titicaca on the border with Bolivia. The combination of altitude, body of water, and traditions makes the region culturally and scenically distinctive.
Selva: Amazon region and biodiversity
The Selva covers a large part of the country and is one of the most biodiverse regions on Earth. Rainforest, rivers, tributaries, oxbow lakes, and seasonally flooded forests create a dense mosaic of habitats. Numerous indigenous communities live there, each with their own languages, knowledge systems, and ways of using nature.
Its significance extends far beyond Peru because water balance, carbon storage, and regional weather patterns are strongly linked to large forest areas. Pressure arises from infrastructure, illegal logging, mining, and oil spills, which can impact individual river sections and fish stocks.
Rivers and water systems
Peru's water flows roughly in three directions: towards the Pacific coast, into the Amazon basin, and into closed highland basins. The largest portion of the country drains towards the Atlantic via the Amazon system.
Amazon system in Peru
Several Peruvian rivers form the upper reaches of the Amazon. The Ucayali plays a crucial role as a headstream, fed by major Andean rivers. The confluence of the Ucayali and Marañón is often considered the beginning of the Amazon in Peru, while the question of its most distant source is answered differently depending on the definition used.
Rivers of the Costa
Many coastal rivers carry highly variable water volumes seasonally. High demand arises from cities and irrigated agriculture. Therefore, storage facilities, canals, and efficient distribution are crucial, especially during dry years.
Climate by region
Peru's climate is heavily influenced by altitude, proximity to the sea, and exposure. Three simple guidelines help in understanding it: dryness along the coast, varying altitudes in the Andes, and warmth and humidity in the Amazon region. A single day of travel can encompass very different weather patterns, such as cool coastal fog, sunny highlands, and humid tropical air.
Costa
- Very low rainfall in many areas
- Frequent foggy conditions, especially near the coast
- Heavy dependence on Andean water for agriculture
Sierra
- Temperature decrease with increasing altitude
- Significant differences between sunny and shady sides
- Rainy and dry seasons vary in intensity depending on the region.
Selva
- High humidity and frequent rainfall
- Rivers as central transport and lifelines
- Seasonal flooding periods in many lowland areas
Natural Highlights
Lake Titicaca
Lake Titicaca lies at an altitude of approximately 3,810 meters and is one of the world's highest navigable lakes. Its location on the Altiplano shapes the climate, culture, and landscape around Puno on the Peruvian side.
Nazca Lines
The Nazca Lines are located in a very dry coastal desert and consist of large-scale geoglyphs. Their exceptional state of preservation is closely linked to the arid climate and the fragile soil surface.
Colca Canyon
The Colca Canyon in the Arequipa region is one of the deep canyon systems of the Andes. Significant differences in altitude, terraced fields, and condor observation points make the valley a well-known scenic area.
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, while at the same time the retreat of ice cover is visible in many places.
Current topics
Protection of the Nazca Zone
In June 2025, a previously reduced size of the protected zone around the Nazca Lines was lifted. A technical working group is tasked with developing a robust zoning plan and management concept based on expert studies.
Rights of rivers in the Amazon
In the Peruvian Amazon, court rulings and local initiatives are increasingly attracting attention as efforts are made to strengthen legal protections for river ecosystems. A key focus is on pollution risks from oil and mining along individual tributaries.
FAQ on the Geography of Peru
Which three major regions best describe the geography of Peru?
The division into Costa, Sierra, and Selva describes the coast, the Andean highlands, and the Amazon region. Many climate and landscape features can be quickly categorized using this system.
Why is the coast of Peru often so dry?
A cold ocean current off the coast cools the air. Fog is frequent, while heavy rain clouds are becoming less common. Additionally, the rain shadow of the Andes inland causes further drought in many coastal areas.
Where does the Amazon begin in Peru?
The confluence of the Ucayali and Marañón rivers near Iquitos is often considered the starting point of the Amazon. However, the question of its most distant source remains open depending on the measurement method and definition, as several source rivers are possible.
What role do rivers play on the coast?
Rivers from the Andes create fertile valleys in an otherwise arid region. Agriculture, urban growth, and industry there depend heavily on water supply and irrigation.
What is the elevation of Lake Titicaca?
The water's surface lies at approximately 3,810 meters. Altitude influences temperature, air oxygen content, and adaptation to daily life, especially during physical exertion.
Which natural highlights are suitable for initial orientation?
A good starting point for your selection includes Lake Titicaca, the Nazca Lines, the Colca Canyon, and the Cordillera Blanca with Huascarán. A quick way to orient yourself is by considering whether the location is in the Costa, Sierra, or Selva regions.
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Sources
- CIA World Factbook, Peru, archived data on area, borders and coastline, 2022-2023 edition
- Encyclopaedia Britannica, Peru, Overview of Costa, Sierra and Amazonia
- Encyclopaedia Britannica, Amazon River and Ucayali River, information on headwaters and length question
- UNESCO World Heritage Centre, Lines and Geoglyphs of Nasca and Palpa
- Encyclopaedia Britannica, Lake Titicaca, altitude and importance as a navigable high-altitude lake
- UNESCO World Heritage Center, Huascarán National Park, elevation information for Huascarán
- Reuters and Associated Press, reports on the protection zone around the Nazca Lines, June 2025