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Sea Level Rise SimulatorMapLibre · DEM tiles

Simulate Coastlines After Sea Level Rise

Blend satellite imagery with terrain elevation and preview regions that fall below a custom sea-level threshold.

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Sea Level Rise Map Guide

Visualize coastal flooding from rising sea levels

This interactive simulator overlays a sea-level threshold onto real terrain elevation and highlights every region that falls below it. Move the level up or down to inspect changing coastlines, river deltas, and low-lying cities on a flat map or 3D globe.

How the sea level simulator works

  1. Pick a target sea level, from a small rise to several metres.
  2. The map shades every area whose elevation sits below that level.
  3. Switch between the 2D map and 3D globe to explore any coast.
  4. Export an image to share the flooded extent you found.

What the blue overlay means

The overlay reads elevation from an open global digital elevation model. It is a terrain-threshold visualization, not a hydrological forecast: tides, storm surge, drainage, and land subsidence are outside the model.

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Sea level simulator FAQ

What does this sea level rise simulator show?

It overlays a sea-level threshold you choose onto terrain elevation and highlights every area that sits below that level, so you can preview which coastlines and low-lying regions would be underwater at that height.

How much has sea level risen, and how much more could it rise?

Global mean sea level has risen roughly 20 centimetres since 1900 and the rate is accelerating. Depending on future emissions, projections span roughly several tenths of a metre to more than a metre by 2100, with larger changes possible over later centuries.

Is this a real flood model?

No. It is an elevation-based bathtub visualization that shades all land below the chosen level. It does not model tides, storm surge, waves, drainage, or land subsidence, so it is best used as an educational illustration of exposure rather than a flood forecast.

Why do some inland areas appear flooded?

The map shades any location below the selected elevation, so closed basins that already lie below sea level, such as the Caspian Depression or Death Valley, can light up even though no ocean water connects to them.

What elevation data does the map use?

It renders an open global Terrarium-encoded digital elevation model with MapLibre GL. The resolution is limited to roughly tens of metres per pixel, so narrow channels, sea walls, and small islands may be shown approximately.

Educational elevation visualization only; this is not a flood forecast.