Parque Nacional Aarón de Anchorena: A Protected Riverine Landscape in Colonia Department

The territory where the park now stands has a long human history. In 1527, on orders from the Venetian explorer Sebastián Gaboto, a small Spanish fortín named San Lázaro was erected in this region of the Río de la Plata, marking one of the earliest European outposts in the area. Although the fort was abandoned within a few years, the episode connects the landscape to the first chapter of European presence in the Río de la Plata. In 1552, a second fort, the fuerte de San Juan, was founded nearby by Juan Romero under Domingo Martínez de Irala, but it too was abandoned after repeated Charrúa attacks.

The modern history of the park begins with Aarón de Anchorena, whose vision shaped the land. In 1907, while crossing the Río de la Plata by balloon alongside his friend Jorge Newbery, Anchorena became fascinated by the north of the department of Colonia. His mother purchased around 11,000 hectares at the mouth of the Río San Juan, and over the following years Anchorena transformed the property into a grand estancia. He traveled the world on his ship "El Pampa," importing more than two hundred tree and shrub species from many continents and introducing animals such as axis deer from India, wild boar, kangaroos, buffaloes, and pheasants. The German landscape designer Hermann Botrich was commissioned to plan the grounds, while the original country house, a chapel, a dovecote, a nursery, and the striking Torre Gaboto were built to Anchorena's taste.

By the late 1930s, Anchorena's debts threatened the estate, and his wife Zelmira Paz sold her famous Buenos Aires residence, the Palacio Paz, to lift the mortgage and preserve the property. After Anchorena's death on 24 February 1965, around 1,370 hectares surrounding the original house were left to the Uruguayan state, subject to detailed conditions on conservation, public access, presidential use, and river access. The state accepted the bequest in 1968, and the park was opened to organized public visits in November 1990. Since then, the historic Anchorena house has functioned as Uruguay's presidential country retreat, hosting dignitaries from around the world while also serving as a site for guided interpretation of the park's natural and cultural values.

Ecologically, the park is unusual in Uruguay because so much of its vegetation was deliberately assembled rather than naturally formed. The Anchorena estate functions as the country's second important arboretum, after the Arboretum Lussich, with broad collections of trees and shrubs from temperate, subtropical, and even distant regions. Notable plantings include white poplar, cork oak, araucarias, maples, bald cypress, more than fifty varieties of eucalyptus, liquidambar, native willows such as the sauce criollo, and the South American tipa.

Alongside these introduced species, the park preserves native riverbank vegetation and local woodland typical of the Río de la Plata region. The blend of exotic and native plants, set against a backdrop of open plains and estuary waters, gives the park a strongly hybrid ecological character that is rare in Uruguay's protected areas.

The rivers that border the park enrich this ecological profile. The Río San Juan and the Río de la Plata bring riparian habitats, transitional waters, and the influence of one of South America's largest estuarine systems into the protected area's natural setting.

The park's most recognizable wildlife presence is its herd of axis deer, originally introduced from India by Aarón de Anchorena. These elegant spotted deer adapted readily to the Uruguayan countryside and are now a familiar sight in the park, moving in visible groups across the lawns and open areas. They have also spread beyond the park into surrounding regions.

Other animals introduced by Anchorena have had very different fates. Wild boar, possibly brought in for hunting, escaped and spread across Uruguay, becoming a national pest. Kangaroos, buffaloes, and pheasants, once kept on the estate, no longer survive in the country. Together, these stories of introduction and spread make the park a striking example of how introduced species can transform a landscape, both visually and ecologically.

The river and estuary setting of the park also supports native birdlife and other local fauna typical of the Río de la Plata basin, contributing a regional ecological backdrop to the more famous introduced mammals.

The park is doubly recognized for conservation. As a parque nacional, it is part of Uruguay's national system of protected areas, and separately it has been declared a Monumento Histórico Nacional, acknowledging its importance as a cultural and natural heritage site.

Its conservation value lies in the combined protection of a remarkable arboretum, an unusual set of introduced but adapted species (most notably the axis deer), and the river and estuary environments of the Río San Juan and Río de la Plata. The bequest terms imposed by Aarón de Anchorena also gave the park an unusually long-term conservation mandate, requiring that the land be preserved for public enjoyment, ecological protection, and educational use, rather than being converted to other purposes.

The park therefore serves multiple conservation functions at once: protecting rare and diverse plant collections, maintaining a green corridor along the rivers, preserving historic structures, and offering a controlled setting where introduced species can be observed and studied in a managed landscape.

The park carries a layered cultural identity. Its earliest historical ties reach back to the first Spanish expeditions on the Río de la Plata, including the short-lived San Lázaro fortín erected under Sebastián Gaboto in 1527 and the later fuerte de San Juan founded in 1552, both of which connect the landscape to the opening chapter of European presence in the region.

In the twentieth century, the estate became a symbol of the cosmopolitan life of the Río de la Plata aristocracy. The original Anchorena house, built in 1911 in a blend of Norman and Tudor styles, reflects European architectural influences transplanted into the Uruguayan countryside. Its transfer to the state as a presidential country residence added another layer of identity, making the park a venue for diplomatic meetings and state ceremonies alongside its natural functions.

The Torre Gaboto, with its commemorative role honoring the early explorer Sebastián Gaboto, anchors the historical memory of the park, while preserved rural buildings, the chapel, the dovecote, and the nursery preserve the atmosphere of a traditional criollo estancia refreshed by Anchorena's worldwide travels.

The Torre Gaboto, the long-established herds of axis deer grazing the open grounds, and the extensive arboretum of more than two hundred introduced tree species together give the park a distinctive and memorable profile. Its dual character as Uruguay's second important arboretum and a working presidential retreat adds a rare combination of natural and political heritage.

The park's river setting, where the Río San Juan meets the broad Río de la Plata, adds further distinction. Wide estuary views, riverbank habitats, and the calm of large open spaces give visitors a clear sense of the South American river coast that is hard to find elsewhere in Uruguay's protected-area network.

The Río de la Plata region has a temperate climate with mild winters and warm summers, and the park can be rewarding across much of the year. Spring and early summer tend to highlight the arboretum plantings, when many introduced trees and shrubs are in active growth or bloom, while autumn brings softer light and changing foliage across the groves.

Wildlife observation, especially of axis deer and birdlife along the riverbanks, is generally easier in the cooler and drier months, when animals are more visible in open areas and insects are less active. Summer visits bring warmer conditions for touring the grounds but should be balanced with attention to heat and river breeze. The park's setting on the estuary means that weather over the Río de la Plata can shift views and atmosphere quickly throughout the year.