#30DayMapChallenge 2026
One map a day through November, organised together on GitHub under the OSGeo:UK umbrella.
The #30DayMapChallenge is a daily mapping challenge open to everyone. Every November, participants create one map a day for 30 days, each based on a different theme, and share them on social media using the hashtag #30DayMapChallenge.
This year OSGeo:UK is organising maps together in the osgeouk/30DayMapChallenge repository. Everyone is welcome, whether you are a GIS expert or have never made a map before.
Taking part
- Maps can be prepared in advance, but the spirit of the challenge is to publish one on each themed day.
- Post your map to Bluesky, Mastodon, LinkedIn, Instagram, X or any platform you prefer with the hashtag. No sign-up is needed.
- There are no restrictions on the tools, data or technologies you use, and fewer than 30 maps is also fine.
- For data sources, software and tutorials, see the official Mapping resources page.
Collaborating with OSGeo:UK
Each daily theme has its own GitHub issue, labelled by year.
- Pick a day and comment on its issue with ideas, data sources and approaches.
- Assign yourself if you want to take the lead on a map, or join someone else’s.
- Link or attach the finished map to the issue before publishing it on the themed day.
2026 themes
Themes are from 30daymapchallenge.com. Each day links to its issue in the OSGeo:UK repository.
| Day | Theme |
|---|---|
| 1 | Points |
| 2 | Lines |
| 3 | Polygons |
| 4 | Clusters |
| 5 | Senses: Sight |
| 6 | Vintage |
| 7 | 10 minute map |
| 8 | Utopia |
| 9 | Urban-rural |
| 10 | Prompting only |
| 11 | Senses: Sound |
| 12 | Power |
| 13 | Interactions |
| 14 | Borgesian map |
| 15 | Inside out |
| 16 | Collaborative map |
| 17 | Light & dark |
| 18 | NULL |
| 19 | Senses: Smell |
| 20 | Hexagons |
| 21 | OpenStreetMap |
| 22 | Projections |
| 23 | Senses: Taste |
| 24 | Network |
| 25 | Is this a map? |
| 26 | Water |
| 27 | New tool |
| 28 | Senses: Feeling |
| 29 | Raster |
| 30 | Pen & paper |
Full descriptions of each theme are in the repository README.
Code of Conduct
Please follow the challenge’s Code of Conduct:
- All maps you publish have to be your original work.
- Give credit to the original data source whenever possible.
- The challenge is about creativity, openness and the joy of beautiful maps and cartography. It is not a competition.
- Be smart with AI tools, and be open about how you made your map. Day 10 (Prompting only) is the exception for prompt-only maps.
- Don’t harass or steal from others.
Follow the hashtag on Bluesky, Mastodon, LinkedIn and Instagram.