u/Character-Q

I’m just starting to learn about rivers so I hope this isn’t a dumb question but I was curious by how much these tributaries seem to twist and bend in so many ways before merging with the Danube. One, the Olt, even cuts directly through the Carpathian Mountains before joining like it was seemingly undeterred by the mountain range. Most of the rivers I’ve seen have tributaries that connect in a more predictable pattern. Is this aspect of the Danube rare or are there many other rivers with tributaries like this?