Cape
From the top of a mountain you see something that looks like a big lip ring jutting out into the ocean: it's a cape! You know, the geological formation where a big piece of land sticks out into the ocean? That kind of cape.
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さき
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Looking down at the cape, you realize capes always make the coastline look jagged, like a saw or key (さき). Thanks for keeping the coastline interesting, you saw-key capes!