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Mapper since:
January 01, 2021
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About me

My nickname is Koreller, I’m a french contributor, I was born in 1995 and I live in Nantes. I am registered in OSM since January 1st 2021 and I started to contribute since July 2021.

Besides, I am a contributor to the Wikimedia projects (Wikipedia, Wikisource, Wikidata and Commons) since 2015.

See my diaries if you’re interested in a complete thematic guide, skyscrapers, how to map a capital city, or even 3D OSM at a glimpse!


I’m mainly focusing on mapping North Korea, for which I created a contribution guide on the wiki North Korea Mapping Guide, the french language version is the most up-to-date, and especially in Pyongyang. Early 2024, I began work on Ashgabat.

I also make some minor corrections in my department, but because it’s already well mapped, I prefer to map other areas.

Why am I mapping?

Mainly for the beauty of the maps, I love making and seeing beautiful maps full of detail and feeling the work behind the maps.

Secondly, on OpenStreetMap (as on Wikipedia in French) I like to do areas (or subjects) where I feel the added value is maximum: on OpenStreetMap mapping cities where almost no other detailed web map exists or is easily accessible, on Wikipedia in French it’s subjects for which Wikipedia in English has no article, that’s what I prefer!

My work on North Korea comes from the fact that it is unfortunately rare to have complete sources on any aspect of North Korea, and maps are a way of having something complete on certain themes. This data can be used by a whole range of actors, whether they be scientists, humanitarian aid workers, international organizations or the simply curious.

I’m particularly interested in the cities of totalitarian countries (aka Pyongyang, and now Ashgabat), because the diversity of things to map is great, and they’re quite mysterious!

Work in progress


  • Mapping all buildings of Wonsan (North Korea)

Past work


“Keep OSM weird and fun”