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ATLAS REPORT

Mangrove ecosystem report: The Gambia

Generated 15 October 2026, 04:02 from live Atlas data

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Executive summary

Atlas holds 84,775 mapped features and 37,971 observations in 21 datasets. The mapped mangrove canopy covers 70,792 ha in 3,090 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.174 ha, while patches of 10 ha or more hold 97.6% of the area. 0 ha (0.0%) lies within 10 km of the LAPSSET development footprint.

Single mapping epoch (2019). Areas are geodesic hectares recalculated from geometry.

Species & formations

FormationPolygonsArea (ha)ShareMean patch (ha)
Mangrove3,09070,791.8100.0%22.91
Shannon evenness by area: 0.00

Fragmentation & landscape metrics

Patches
3,090
Mean / median / largest
22.91 / 0.174 / 10,266.7 ha
Effective mesh size
2,866.7 ha
Largest patch index
14.5%
Power-law exponent α
1.49

Spatial clustering

Global Moran’s I = 0.011 (z = 0.4, p = 0.713). Hot-spot cells (Gi*, ≥95%): 13; cold-spot cells: 6.

Top hot-spot cellPolygonsArea (ha)Gi* z
13.3, -16.1551292.79
13.2, -16.15252152.63
13.2, -16.231,3712.59
13.4, -16.2522992.51
13.45, -16.263,4862.48
13.25, -16.15152,6142.47

Methods & limits

Areas and lengths are recomputed on the WGS 84 ellipsoid; units are harmonised (ha, m, %, UTC). The mapping is a single 2019 epoch; the source publishes no licence; field plots are a sample; scenario figures are illustrative assumptions. Cite the original publishers listed above. Full methods: Methodologies page.
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