system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does some ocean waters seem so crystal clear and others aren't as blue?

Why do some parts of the world have the most beautiful shores and clear water but others are meh...
gpt
If you notice the areas with clear waters, they are tropical and are usually on the east coast of a continent.   
That's actually because the way water flows around the equator stacks up warm oceanic water along the east coast of continents.    
   
Along the west coast, and at more extreme latitudes, the water is coming from the local area and is full of sediments.   
By getting all of the clean oceanic water, the east coasts get water that has had the sediments settled out of it.   
   
(Edit: Typo.)