Main European drainage divides (red lines) separating catchments (green regions). Source: Wikipedia

24 comments
  1. The Donau never fails to impress.

    But TIL the Djnepr is also quite impressive.

    Would be nice to see the full scale of the Wolga.

  2. Cam is a little inaccurate, as that’s the catchment of the River Great Ouse, of which the Cam is a tributary.

  3. When I see maps like this I always wonder…

    Are the bigger areas more likely to be dirtier? As in, their rivers are running for thousnds of miles and have a lot more of time to gather more pollution?

  4. I use maps like these for lectures regarding the health of the baltic sea. 85 million people live in that drainage basin, some countries that dont even border the sea. And the sea can barely renew its own water since the strait by Danmark is so narrow, and the flow direction is away from the baltic sea into the north sea.

    All rain that falls within this zone will take with them nutrients from the farms, and dump them into rivers that flow towards the sea. Causing massive amounts of algae/cyanobacteria populations to grow.

    When these later die from natural causes, they fall to the bottom and have to be broken down by decomposers, these decomposers will boom in population and consume all oxygen. Killing the seafloor, themselves, and fish eggs with them. Causing a death spiral where all problems enhance each other.

    For example, some larger fish like cod die since cod eggs have trouble surviving, causing their small fish prey to rise, these smaller fish eat zooplankton. When zooplankton fall in numbers, their prey in turn rise, which are the problematic phytoplanktons that thrive too much currently.

  5. I have always found it interesting how the Baltic Sea is called the East Sea in German and Swedish for example, but the West Sea in Estonian for example.

  6. There is a canal connecting the Rhine and the Danube via the Main river. Meaning you can ship goods from the Netherlands up to the Black Sea only by rivers!

  7. Just a reminder that there’s a river in Romania called Prout. Which means fart in French.

    That’s all for me thanks

  8. could someone define drainage divides and seperating catchments? im personally kinda confused on what this map is showing

  9. Black sea and bosphorus don’t seem to be crazy important until you see map like that and see that 1/3 of the drainage of Europe by are is going through there. It was even more important in the past when trade was more reliant on river transport.

  10. I grew up near the drainage divide of the Rhine and Danube. As a child, you could always play a game on hikes: If I pee here it will flow into the North Sea, if I pee here it will flow into the Black Sea.

  11. This map shows that there is a mountain somewhere in Silesia, where you can spin around and pee into Black sea, Baltic and North sea at the same time

  12. The tripoint between the Baltic, the Black and the Caspian seas is defined as 55 50 0N 33 52 20E on Russian basin maps, and is *very* close to the source of the Dnieper itself.

    It’s also not a hill as you might expect, but a big great bog.

  13. Why is that there seems to be more smaller rivers on the Western side of Europe, and fewer but larger rivers on the Eastern side?

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