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ATLAS REPORT

Mangrove ecosystem report: Tanzania

Generated 15 October 2026, 08:20 from live Atlas data

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Executive summary

Atlas holds 4,378,279 mapped features and 77,355 observations in 225 datasets. The mapped mangrove canopy covers 111,509 ha in 7,458 polygons across 1 formation classes; Mangrove dominates with 100.0% of the area. The median patch is only 0.178 ha, while patches of 10 ha or more hold 95.8% 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)
Mangrove7,458111,509.4100.0%14.95
Shannon evenness by area: 0.00

Fragmentation & landscape metrics

Patches
7,458
Mean / median / largest
14.95 / 0.178 / 4,464.6 ha
Effective mesh size
941.2 ha
Largest patch index
4.0%
Power-law exponent α
1.46

Spatial clustering

Global Moran’s I = 0.079 (z = 2.5, p = 0.013). Hot-spot cells (Gi*, ≥95%): 30; cold-spot cells: 8.

Top hot-spot cellPolygonsArea (ha)Gi* z
-7.85, 39.384,2913.48
-7.8, 39.371,8583.44
-7.85, 39.35539313.04
-8.15, 39.35461,5222.99
-8.95, 39.4214352.97
-9, 39.4218602.85

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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