Tunisia's low-lying coastal land in three bands (below 1, 2 and 5 metres) with the population in each, and a table per coastal delegation.
The product separates land actually connected to the sea from closed depressions such as the chotts and sebkhas (1,288 km²) — a crucial distinction, since a closed depression is not flooded by the sea merely because it is low.
In short
2,912 km² of coastal land lies below five metres, home to 940,953 people (7.7% of the country).
Below one metre: 1,030 km² and 48,925 people.
The delegations with the most people below five metres are listed in the table.
Who it is for
Environmental and climate organisations, coastal municipalities, consultancies, researchers and insurers.
Method: what we add to the raw data
- Elevation cells below each threshold were taken from the 90 m model.
- Land connected to the sea was separated by connected growth from the sea through low cells: anything not connected is a closed depression, not land exposed to inundation.
- Closed depressions are supplied as their own layer so the user sees them instead of having them silently dropped.
- The bands were read against the population distribution, giving population per band rather than land area alone.
- Results were aggregated per coastal delegation: area and population in each band and their share.
Product details
| What you get | 4 spatial layers in GeoPackage, 3 GeoTIFF rasters, 2 CSV tables, lyrx and qml symbology for ArcGIS Pro and QGIS, a PNG map at 220 dpi, and an Arabic and English guide |
|---|---|
| Formats | GPKG, GeoTIFF, CSV, lyrx, qml, PNG |
| Coordinate system | WGS 84 (EPSG:4326) |
| Licence | Commercial use allowed for you and the organisation you buy for; no resale or redistribution |
| Delivery | A private download link valid for 24 hours, within 6 hours of payment confirmation |
| Package size | ZIP 4.0 MB |
| Personal data | The product contains no personal data |
Spatial layers
low_elevation_zones— polygons, 3: Low-lying coastal land by bandclosed_depressions— polygons, 16: Closed depressions not connected to the seainland_low_basins— polygons, 1: Inland low basins connected to the sea through a corridor (the chotts)coastal_delegations— polygons, 77: Coastal delegations with area and population per band
Raster files (GeoTIFF)
D101_low_elevation_bands.tif— 4,439 × 9,119, 90 m: Low-elevation bands connected to the seaD101_closed_depressions.tif— 4,439 × 9,119, 90 m: Closed depressionsD101_inland_low_basins.tif— 4,439 × 9,119, 90 m: Inland low basins (the chotts)
Tables
D101_low_elevation_zones.csv— 3 rows: Area per bandD101_coastal_delegations.csv— 77 rows: Coastal delegations
Limitations
- This is elevation-based exposure, not inundation modelling: it excludes tide, storms, defences and land subsidence.
- The surface model includes buildings and trees, raising elevations in cities and reducing the area counted below a threshold.
- 90 m cells do not represent narrow barriers such as raised roads and coastal dykes.
- The population distribution is a model, not a census, so figures are estimates.
- The thresholds are fixed (1, 2 and 5 m) and do not represent any specific sea-level scenario or time horizon.
- The inland chotts (Tozeur and Kébili) connect to the Gulf of Gabès through the low Chott el Fejej corridor, so they qualify as connected while not being coastal. They are excluded from the coastal figures (beyond 25 km from the sea) and supplied as a separate layer of 54 km².
FAQ
- How long does delivery take?
- Up to 6 hours after payment is confirmed.
- How long does the download link last?
- 24 hours, and it is renewed free on request.
- Can I get a refund?
- Digital products are not refundable once downloaded — unless the file is defective or does not match the description, in which case it is replaced or fully refunded.
- What does the licence allow?
- Commercial use is allowed for you and the organisation you buy for; resale or redistribution is not.