For that indicator, FAO provides data for Tanzania from 1990 to 2016. The average value for Tanzania during that period was 507417.8 sq. km with a minimum of 456880 sq. km in 2016 and a maximum of 559200 sq. km in 1990.
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Definition: Forest area is land under natural or planted stands of trees of at least 5 meters in situ, whether productive or not, and excludes tree stands in agricultural production systems (for example, in fruit plantations and agroforestry systems) and trees in urban parks and gardens.