Looking at Tanzania relation on OSM, I see that it has several subarea linking to Zones - like Northern Zone. Looking at wikipedia, the first administrative subdivision seems to be 22 Regions, not 7 Zones.
So, here is the question: are these seven Tanzanian Zones official?
For a bit of context: I need stable OSM relations to generate smaller extracts for Osmose QA, as Tanzania is getting a bit too big now.
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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/zones-in-tanzania/4830