Cartagena Under Water
March 29 2026
Cartagena de Indias sits on a narrow strip of Caribbean coastline where much of the city is barely one to two meters above sea level. The best recent local measurements suggest Cartagena’s relative sea level rose about 7.02 millimeters per year between 2000 and 2019, a pace that is being amplified by land subsidence as well as global ocean rise.
That makes Cartagena’s climate story unusually concrete. The city combines a UNESCO-listed fortified core, low-income neighborhoods on marsh and lagoon edges, and infrastructure like Rafael Núñez Airport that handled 7.76 million passengers in 2025 alone. The threat is not one cinematic disaster. It is a gradual redefinition of what counts as reliably dry land, high tide after high tide.
Cartagena is not an exception. According to the IPCC AR6, by 2050 roughly 1 billion people worldwide will be exposed to coastal flooding that was once considered rare. Events that occurred once per century are now projected to happen 20–30 times more frequently. What plays out in Cartagena is an early, unusually concrete version of a decision every low-lying coastal city will eventually face.
A city already losing ground
The map and chart below translate the projection into geography. Each year forward is another increment of land that crosses below the water line: not a single catastrophe, but a slow, compounding loss of margin. The dots on the chart mark moments when specific parts of the city reach critical thresholds; hover over them to see what that means on the ground.
Move the slider or press play to step through the projection year by year.
Flood exposure map
Red indicates land projected to fall below the water line in the selected year. Amber marks the narrow band closest to that threshold.
Sea level rise projection
The line tracks local relative sea-level rise through 2100. The dots mark moments when exposed parts of the city cross more critical thresholds.
Reading the pressure
How fast Cartagena loses room to absorb rising water.
The curve does not rise at a constant pace
What looks gradual early on becomes much steeper after mid-century.
Local land motion changes the story
Subsidence makes Cartagena’s local trajectory more aggressive than ocean rise alone would suggest.
Seasonal water levels already compress the margin
Rainy-season water levels can push the city closer to critical thresholds much earlier.
Why the local curve is steeper
These are not projections. They are present-day measurements that explain why Cartagena’s trajectory is more aggressive than a global ocean-rise figure would suggest.
The water is rising and the ground is sinking. Both effects accumulate in the same direction.
This scenario combines a high-emissions IPCC pathway with local subsidence. Because the SRTM elevation model tends to overstate ground height in dense urban areas, real exposure can be worse than the map suggests.
The window to act is already open
Coastal adaptation cannot be improvised. Every protective measure, from elevating buildings to relocating communities, requires years, often decades, of planning, funding, and political coordination before it takes effect. Cartagena's first critical thresholds arrive around 2040, less than fifteen years from now.
Typical planning and implementation timescales. Source: IPCC AR6 SYR Figure 3.4.
Cartagena is not waiting for a distant scenario. The measurements are in, the trajectory is clear, and the first thresholds are close enough that the children living in La Boquilla today will see them crossed in their lifetimes. The walled city that survived three centuries of siege was built to resist a threat that came from the sea. The threat has come again, slower, quieter, and with no clear armistice in sight.
The question is not whether the water will keep rising. It will. The question is whether the decisions that shape the next hundred years begin while there is still time to make them deliberately.
References
- NASA SRTM3, 90m resolution surface elevation model.
- IPCC AR6 high-emissions sea-level range, adapted with local subsidence rates.
- Base map tiles by CARTO, data by OpenStreetMap contributors.
- Scientific Reports: Coastal subsidence increases vulnerability to sea level rise over twenty first century in Cartagena
- IPCC AR6 sea-level rise summary figure
- UNESCO World Heritage Centre: Port, Fortresses and Group of Monuments, Cartagena
- Rafael Núñez Airport: 2025 passenger record