Recommendations
Insights computed from Atlas’ own data by a transparent rules engine. Each one shows its evidence, the calculation behind it and how confident Atlas is.
4 of 9 themes have no data yet
Atlas holds no records for: Blue Carbon, Restoration Sites, Wildlife & Habitats, Farming & Livelihoods. Seagrass and salt marsh would come from UNEP-WCMC global datasets; carbon projects from the Verra and Gold Standard registries; community projects from partner programmes.
Evidence and method
- Calculation
- Modules with zero mapped features.
- Sources
Licence terms to be confirmed for 209 datasets
Licence terms are being confirmed with the publisher. Atlas holds the data for scientific and internal use and shows the original attribution, but cannot grant bulk redistribution rights.
Evidence and method
- datasets without licence
- 209.00
- Calculation
- Datasets whose licence status is "unspecified by publisher".
- Sources
Most polygons are very small, but most area sits in large stands
40.1% of the 7,458 mapped polygons are under 0.1 ha, yet patches of 10 ha or more hold 95.8% of all mangrove area. Management and monitoring effort should focus on the large stands, while the small-patch tail needs checking against satellite imagery.
Evidence and method
- polygons
- 7,458.00
- tiny pct
- 40.10
- area in ge10ha pct
- 95.80
- Calculation
- Counts and sums of geodesic polygon areas grouped by size class.
- Sources
- lamu-mangroves-species-formation-2019
Net loss of mangrove since 1996
Global Mangrove Watch maps 114,277 ha of mangrove in Tanzania in 1996 and 113,237 ha in 2025: a net loss of 1,040 ha (-0.9%), about 36 ha per year. This is the net balance of total mapped area; gains and losses inside the country can cancel out, so real loss may be larger.
Evidence and method
- last ha
- 113,237.00
- net pct
- -0.90
- first ha
- 114,277.00
- last year
- 2,025.00
- first year
- 1,996.00
- Calculation
- Sum of geodesic polygon areas per epoch, compared across years (Global Mangrove Watch v3.0, CC BY 4.0).
- Sources
- gmw-v4-1996-tz