On: Ask HN: What's the coolest website you know?

[eastdakota]

I love this:

https://river-runner-global.samlearner.com/

Click on any spot on Earth and see where a raindrop there will flow until it reaches an ocean.

[noduerme → eastdakota]

This is frankly amazing. Something I've thought about a lot as I've traveled and crossed various continental divides, but never even considered actually trying to map.

[qubex → eastdakota]

A visual watershed in watershed visualisation.