This headland extends about three kilometers into the sea.
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岬 is a formal geographical term. In place names it often appears as 岬角 (cape/headland point). Common in proper nouns: 好望角 (Cape of Good Hope), 科德角 (Cape Cod).
Three peaks on the left identify 岬 as a kind of landform. A cape or headland is essentially a small ridge thrusting into the sea, so the mountain radical neatly captures the landscape, alongside 岭, 岸 and 峡.
Carries the sound jiǎ unchanged. Its sense of armoured shell is incidental, but you can imagine a cape as a hard-shouldered piece of land, a useful hook for remembering the otherwise transparent phono-semantic split.
