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Arenillas Ecological Reserve
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The Arenillas Ecological Reserve is situated in southwestern Ecuador within the El Oro province, near the border with Peru. Spanning approximately 13,170 hectares, it protects one of the most vital remnants of the Tumbesian dry forest, a critically endangered ecosystem. For several decades, the area was managed as a military zone, which inadvertently helped preserve its natural state before it was officially designated as an ecological reserve in 2001. The landscape is characterized by cacti, thorny shrubs, and massive Ceiba trees adapted to prolonged dry seasons. Arenillas is a biodiversity hotspot, especially for birds, with over 150 recorded species, many of which are endemic to the Tumbesian region. Fauna includes mammals like the Sechura fox, howler monkeys, and collared peccaries. The reserve plays a crucial role in preventing desertification and maintaining a biological corridor for species specialized in arid environments.
- Location: Ecuador
- Top sights: Balneario Santa Marianita · Bahía · Capilla
- Nearby: Santa Rosa (10 km)
Best time to visit & climate
The most pleasant time to visit is Jul–Sep.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Rain mm | 64 | 110 | 130 | 61 | 28 | 15 | 12 | 8 | 8 | 17 | 20 | 29 |
📋 Practical info
Best season
The best time to visit Arenillas Ecological Reserve is during the dry season from June to November. During this period, endemic bird species and other wildlife are easier to spot as the vegetation becomes less dense.
Best time of day
Plan your visit for early morning hours when birds are most active, singing and foraging. Late dusk is also a good time to spot nocturnal species such as rodents and owls emerging from their shelters.
Etiquette
Always stay on marked trails to avoid disturbing the fragile dry forest vegetation. It is strictly forbidden to feed animals or remove plants; respect the reserve as a protected area.
What to bring
A quality pair of binoculars and a bird identification guide are essential for spotting endemic species. Sturdy hiking boots and long trousers protect you from thorns and insects in the dense undergrowth.
Getting there
The reserve is located about 30 km southwest of Machala and is accessible by car on the road towards Arenillas. A four-wheel-drive vehicle is recommended as the final kilometers are on unpaved roads.
What to expect
Many endemic birds are shy and hide in the underbrush; take your time and remain quiet at a viewing point. It can take an hour or longer for rare species to show themselves - patience is rewarded with fantastic sightings.
Geography
Facts
- The area was officially designated as an ecological reserve on May 16, 2001.
- It covers a total land area of approximately 13,170 hectares.
- More than 150 bird species are known to inhabit the reserve.
- It protects the highly endangered Tumbesian dry forest ecosystem.
- The site was previously used as a military buffer zone for over 60 years.
- It is a key habitat for the Sechura fox and the Pacific royal flycatcher.
Explore nearby
Notable places around
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Sights in the town Arenillas Ecological Reserve (8)
Sights nearby
Frequently asked questions
What is special about Arenillas?
It protects one of the last areas of tropical dry forest on the coast of Ecuador.
Which birds can be observed here?
Specially the rare El Oro Parakeet and many endemic species of the Tumbesian region live here.
How is the climate there?
It is very hot and dry, often over 30°C. Take plenty of drinking water with you.
Is a permit required?
Yes, as it is a military area, access often needs to be coordinated in advance.
Are there restaurants in the reserve?
No, there is no tourist infrastructure. You must bring your own food and supplies.
Arenillas Ecological Reserve: where is it located?
Arenillas Ecological Reserve is located in Ecuador.
Arenillas Ecological Reserve: what is there to see?
Highlights include Balneario Santa Marianita, Bahía, Capilla.
Arenillas Ecological Reserve: when is the best time to visit?
The most pleasant time to visit is Jul, Sep.
Arenillas Ecological Reserve: why is it worth visiting?
The Arenillas Ecological Reserve is situated in southwestern Ecuador within the El Oro province, near the border with Peru.
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Nearby cities
Machala
Often referred to as the banana capital of the world.
Pasaje
A sunny city whose economy depends heavily on banana and cocoa cultivation.
Santa Rosa
Known for its excellent shrimp farming and small regional airport.
Huaquillas
A bustling border town serving as the main commercial crossing between Ecuador and Peru.
El Guabo
An agricultural center characterized by its cooperative banana farmers.
Arenillas
An arid town with a military presence near the Peruvian border in El Oro.
Piñas
The orchid city of the Andes, famous for its floral diversity and foggy forests.
Zaruma
A picturesque historic gold mining town built on steep hills.
Macará
An important and warm border crossing to Peru in the southernmost part of Loja.
Daule
Known as the rice capital of Ecuador due to the enormous production of this grain.
Durán
An industrial city connected to Guayaquil by a bridge over the Guayas River.
General Villamil Playas
A very popular beach destination that flourishes due to its proximity to Guayaquil.
Tumbes
A vibrant city near the Ecuadorian border, serving as the gateway to Peru's unique mangroves and tropical beaches.
Balzar
Center of cattle breeding and teak production in rural Guayas.
Samborondón
A wealthy suburban community known for its exclusive residential complexes and historic rice fields.
History & landmarks
Monumental Stadium
The largest football stadium in Ecuador and home to the famous Barcelona Sporting Club in Guayaquil.
George Capwell Stadium
Home of the Emelec football club, known for its steep English-style stands and electrifying atmosphere.
Malecón 2000
A famous boardwalk along the Guayas River, showcasing both the modern and historical faces of Guayaquil.
National Unity Bridge
A major bridge complex connecting Guayaquil with the neighboring cities of Durán and Samborondón across the Babahoyo and Daule rivers.
More places
Port of El Oro Province
The official name for Puerto Bolívar, a multipurpose port crucial for the export of bananas, shrimp, and gold.
Zaruma Coffee Farm
Traditional coffee plantations in the mountainous region of El Oro, famous for some of the best Arabica beans in South America.
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Yasuní National Park
Yasuní National Park is one of the most biodiverse places on Earth, a vast area of pristine rainforest in the Ecuadorian Amazon basin.
Puyango Petrified Forest
A world-renowned paleontological site featuring massive fossilized tree trunks and ancient fossils.
Pescanova Shrimp Farm
Large-scale aquaculture farms for the breeding of whiteleg shrimp, one of Ecuador's most important export goods.
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Cerro Blanco Protected Forest
One of the best preserved dry forest areas near Guayaquil, where monkeys and wildcats live.
Port of Posorja (DP World)
A new deep-water port in the Gulf of Guayaquil, designed to handle Post-Panamax ships.
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Holcim Cement Plant Guayaquil
A large cement production facility on the outskirts of Guayaquil, serving the coastal market and export routes.