Welcome to the June 2026 edition of #fridaygeotrivia, our social media geotrivia contest.
Traditionally we play on the final Friday of the month, but that is not possible this month, so we will push back by a week to Friday, 3rd of July, 2026, at 17:00 Berlin time, 4pm London time, 11AM New York time.
See how to play below.
The June 2026 geotrivia question:
Name countries where a single river acts as an international border with at least two different neighboring countries. Name the countries and the river.
As an example, 🇨🇠Switzerland’s border with 🇱🇮 Liechtenstein and 🇦🇹 Austria is the Rhine.
As always:
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Only one answer per toot
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You must include the hashtag #fridaygeotrivia and the emoji flag of the countries
Prizes
#fridaygeotrivia is a game with two prizes:
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the sheer joy of geographic knowledge and pedantry.
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the bragging rights of getting the answer first.
The #fridaygeotrivia Mastodon thread:
The winner
Once again we have to salute Ciarán Ferrie for winning. Congrats also to Pablo M.U. for second place.
This month’s geotrivia answer:
- AF, border with UZ and TJ via the Amu Darya
- AR, border with PY and BO via the Pilcomayo
- AR, border with UG and BR via the Uruguay
- AT, border with SK and DE via the Danube</li
- AZ, border with TR and IR via the Aras
- CD, border with BI and RW via the Rusizi
- CH, border with AT, DE, FR, and LI via the Rhine >
- CM, border with CG and CF via the Sangha
- DE, border with BE and LU via the Mosel
- DE, border with CZ and PL via the Neisse
- DE, border with FR and CH via the Rhine
- ET, border with KY and SO via the Dawa
- HR, border with SI and HU via the Mur
- JO, border with SY and IL via the Yarmouk
- KP, border with CN and RU via the Tumen
- LA, border with MM and TH via the Mekong
- LT, border with PL and BY via the Marycha
- LU, border with BE and FR via the Chiers
- MR, border with SN and ML via the Senegal
- NA, border with AO and BW via the Kwando
- PY, border with BR and AR via the Paraná
- RO, border with BG and RS via the Danube
- RO, border with UA and MD via the Prut
- RW, border with TZ and BI via the Kagera
- SD, border with EG and SS via the Nile
- SK, border with AT and HU via the Danube
- ZM, border with NA and ZW via the Zambezi
- ZW, border with MZ and ZM via the Zambezi </ul> </div> ### How to play ### Anyone can join in, you just need a Mastodon account. * Follow us on Mastodon, our account is [@opencage@en.osm.town](https://en.osm.town/@opencage) * When the game starts we will post the question here on the blog and on Mastodon, and will embed the Mastodon question here. We highly recommend using a mastodon client you feel comfortable with. We've made the switch to [the Elk client](https://elk.zone) and are loving it, but use whatever works for you. * Reply to the question thread on Mastodon (it will be embedded above) using the hashtag #fridaygeotrivia in your answer. * Only one answer per response (don't stuff multiple answers into a single reply). * Our definition of "country" is usually (it depends on the question) any place with an ISO 3166-1 alpha-2 code. Read more [background about ISO and country codes in our guide](https://opencagedata.com/guides/how-to-determine-the-iso-codes-for-a-location). * To get full points for an answer it is good form not just to name the relevant country but (if possible) to include the emoji flags of the country. * While you can use a map, please **do NOT use the internet to just search for an answer**. That is cheating and will lead to seriously bad geokarma. Some people have complained that the format is a bit chaotic and hard to follow. **Yes. The mad chaos is part of the fun. Embrace it. The goal is just to have fun and learn. We win by playing** Thanks for playing, [Ed](https://mastodon.social/@freyfogle)