There’s a lot more stuff in the water when you’re closer to shore. That stuff reflects a lot of light, but places without it absorb almost all the light. So you’ll get a different color near the coast than you would in the open water.
So when its a different color abruptly, its because there is a point where the shallow area abruptly stops, and there’s a current that keeps the stuff in the coastal water from going out any farther.
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