Laguna de Santa Olalla

Laguna de Santa Olalla is the largest lagoon in Doñana National Park, located within the municipality of Almonte, in the province of Huelva, Andalusia. For decades it stood out among the park's more than 3,000 lagoons as one of the few that held water year-round — and today its condition is closely watched as a barometer of the wider ecosystem's health.

What makes this lagoon so significant?

Doñana is famous for its mosaic of seasonal marshes, most of which dry out almost completely every summer. Santa Olalla was long the exception: as the park's largest permanent body of water, it offered waterbirds and other species a refuge even through the hottest months. That has changed in recent years — the lagoon has dried up completely in consecutive summers, a situation researchers from Spain's CSIC (Higher Council for Scientific Research) link to drought conditions and groundwater overexploitation, including extraction tied to the nearby Matalascañas tourist resort. For conservationists, the loss of this summer refuge is a warning sign: fewer places for fauna and flora to hold on until the autumn rains return.

How do you get there?

Santa Olalla sits deep within Doñana's strictly protected core, and there is no free access on foot to the lagoon itself — the area is reserved for researchers and authorized guided routes. Visitors experience this part of Doñana through licensed excursions, including 4x4 tours, departing from nearby towns such as El Rocío or Sanlúcar de Barrameda, or by visiting the park's information centers — José Antonio Valverde, La Rocina, or El Acebuche — which offer marked trails and viewpoints overlooking the marshland. Almonte, the closest larger town, is the natural base for planning a visit and checking current trail access.

What will you see?

Even from a distance, the landscape around Santa Olalla is striking: open marshland, dunes, and Mediterranean scrub form the backdrop typical of Doñana, one of Europe's most important wetlands. The park lies on a major migratory route between Europe and Africa, and the presence of water in lagoons like Santa Olalla directly affects how many birds pass through or stay. When the lagoon holds water, it draws waterfowl and wading birds; when it dries, its exposed bed becomes a visible marker of climate pressure and water-resource strain in the region.

When is the best time to visit?

Winter and spring, after the rainy season and before summer heat sets in, offer the best chance of seeing the lagoon with water. Summer has become the critical period — it's when the lagoon has fully dried out in recent years. Because conditions shift from year to year depending on rainfall, it's worth checking with local tour operators on the current state of the lagoons before planning a Doñana visit.

Frequently Asked Questions

Can you walk to the lagoon on your own? No — the area around Santa Olalla lies within Doñana National Park's strictly protected zone and is accessible only through authorized guided tours or to researchers.

Why does the lagoon sometimes dry up completely? In recent years, drought combined with groundwater overexploitation — partly linked to the nearby Matalascañas tourist resort — has caused it to dry out entirely for several consecutive years.

How important is this lagoon within Doñana? It is the park's largest lagoon and historically one of the few that held water year-round, making it a key refuge for wildlife during the summer months.

Where's the best starting point for visiting Doñana? Almonte and neighboring towns like El Rocío are the most common departure points for organized tours into the park.