Hard to say without knowing the specific location, but there’s a thing called a continental shelf that extends out a ways, generally a couple hundred miles at a depth of maybe 200 feet, from the shoreline of the continent, and then the ocean floor pitches down, often in an almost sheer cliff, to the so-called abyssal deep, which averages well over 10,000 feet. My guess is you were looking at that. And if that makes your balls crawl up, well join the club.
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