When you cruise across the Guatapé reservoir on a boat tour, admiring the turquoise water and scattered green islands, it's easy to forget that none of this existed 50 years ago. The reservoir — Embalse Peñol-Guatapé — was created in 1978 by damming the Nare River valley for hydroelectric power. Beneath the surface of the water you're boating across lie the remains of roads, farms, homes, and the original town center of El Peñol. This is the story most tour guides don't tell.
Before the Flood
The valley where the reservoir now sits was historically agricultural land — farms, pastures, small villages, and the original town of El Peñol. The town had a central plaza, a church, schools, and the daily life of a small Colombian agricultural community. La Piedra del Peñol, the massive rock that's now the region's main attraction, sat above the valley floor, towering over the farmland below.
In the 1960s, Colombia's national energy company (EPM — Empresas Públicas de Medellín) identified the valley as an ideal location for a hydroelectric dam. The project would generate power for Medellín and the surrounding region, but it required flooding thousands of hectares of inhabited land.
The Displacement
The decision to build the dam meant the forced displacement of thousands of residents. The original town of El Peñol was to be completely submerged. The process was contentious. Residents fought the displacement through protests and legal challenges. Compensation was offered, but many families felt it was inadequate for the loss of ancestral land, homes, and a way of life tied to the valley.
A new town — Nuevo Peñol (New Peñol) — was constructed on higher ground to receive the displaced population. The relocation was traumatic for many families. Generations of farming tradition, community bonds, and physical connections to the land were severed. The old church, the old plaza, the old streets — all went under water.
The Flooding
The dam was completed and the valley began flooding in the late 1970s. By 1978, the reservoir had reached its planned level, covering over 2,200 hectares. Where there had been a valley with farms and a town, there was now a vast artificial lake with dozens of islands — the hilltops of the old landscape, now surrounded by water.
The transformation was total. Within a few years, the reservoir had become a significant feature of the Antioquia landscape. The turquoise color of the water — caused by mineral content and algae — made it strikingly beautiful. La Piedra, once a rock sitting above farmland, now stood above a lake, its visual drama enormously amplified by the water stretching away from its base.
What Remains Beneath
During periods of low water level (particularly during strong dry seasons or El Niño events), remnants of the old town become partially visible. The foundations of buildings, sections of road, and the old cemetery have all been spotted when the water drops. For residents old enough to remember the original town, these low-water moments are emotional — brief glimpses of a home that was taken by the water.
A replica of the original El Peñol church was built in the new town as a memorial. Some families kept stones, tiles, or wooden beams from their original homes before the flooding — personal relics of a place that exists now only in memory and photographs.
The Irony of Tourism
The reservoir that destroyed a community became the foundation of a new economy. As the lake matured and became known for its beauty, tourism gradually replaced agriculture as the primary livelihood for the region. The boat tours, the finca stays, the water sports, the views from La Piedra — all of Guatapé's modern tourism industry exists because of the flood that displaced thousands.
This is the uncomfortable truth that hangs over the reservoir's beauty: the lake is gorgeous, and it was born from loss. Many of the families running fincas, restaurants, and tour boats today are descendants of the displaced communities. They've built something new and prosperous on the landscape that replaced their old one. But the memory persists.
Visiting with This Context
You don't need to feel guilty about enjoying Guatapé. The community has rebuilt, and tourism is now the economic engine that supports the region. But knowing the history adds a layer of meaning to the experience. When you look out over the reservoir from the top of La Piedra, you're not just seeing a pretty lake — you're seeing a landscape of transformation, loss, resilience, and reinvention.
If you have the chance, visit the replica church in Nuevo Peñol. Talk to older residents. Ask about the old town. The story is part of the place, and the people who lived it are still here to tell it.