In December 1833, the brig HMS Beagle dropped anchor off the Atlantic coast of Santa Cruz, entering one of the most remarkable hydrographic formations on the planet: the Puerto Deseado estuary.
On board was a young Charles Darwin, whose mind was already beginning to shape the ideas that would revolutionize modern science. What the British naturalist discovered while exploring this deep arm of the sea reaching into the steppe was not only an astonishing abundance of wildlife, but a geological enigma that challenged the logic of the era—one that is today protected as an Intangible Natural Reserve due to its immense scientific and scenic value.
The Deseado estuary holds a unique status in the South American continent: it is the only river in South America to have completely abandoned its original bed, which was subsequently invaded and occupied by the Atlantic Ocean across a stretch of over sixty miles. This geomorphological singularity is the result of eons of erosion that the ancient Deseado River exerted on the surrounding plateau, carving out striking, deep canyons of reddish volcanic rock dating back to the Jurassic period.
Upon exploring these vertical cliffs and setting up camp near what is now historically known as Darwin’s Camp, the scientist was left perplexed by the monumental scale of the stone walls and the absence of a mighty river to justify such massive wear, describing the landscape as a majestic “riverless valley.”
This hybrid ecosystem fosters an extraordinary biological sanctuary. One of the most unique features of this environment is the coexistence of five distinct species of cormorants, strictly marine birds that find the perfect nesting grounds along the vertical canyon walls. Additionally, the estuary serves as a vital home for the Magellanic penguin; these birds faithfully return to establish their primary breeding colonies between the months of October and April on strategic island enclaves such as Islote Punta del Paso, Isla de los Pájaros, Isla Quiroga, and Isla Chaffers.
Along the shoreline, the geography unfolds an array of coastal attractions that highlight both nautical excursions and overland walks, including the Balneario de las Piletas, Punta Cavendish, Cueva de los Leones, Muelle de Ramón, and the imposing Cañadón Jiménez, Cañadón del Puerto, and Paraje la Mina. Uncovering the secrets of the region and planning a journey is possible from Puerto Deseado.
Venturing into its reaches today is, in essence, stepping onto the very stage where the theory of evolution was born in one of the most untamed landscapes on Earth.
