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FKNMS diver and reef (48770613528).jpg
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ledge · Florida Keys

Ten Fathom Ledge

intermediate 11–35 m · 35–115 ftledgecoral caves/overhangsdrift divenearby wreck (All Alone)
NOAA FKNMS · Public domain

A line of coral ledges and small caves on the outer reef south of Key West, often dived as a drift. Overhangs shelter grouper and lobster while rays and sharks patrol the edge.

Ledge top 35-50 ft is within recreational limits; seaward side falls to ~115 ft and the site is often dived as a drift in Gulf Stream current, so intermediate/advanced.

Related
Wreck of the "All Alone", a ~75-ft tug hull, reported just off the outer ledge in ~90 ft (no authoritative coordinates).

Commonly seen

black grouper Caribbean spiny lobster spotted eagle ray nurse shark Caribbean reef shark hogfish great barracuda

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Sanctuary data: NOAA Florida Keys National Marine Sanctuary. Artificial reef data: Florida Fish and Wildlife Conservation Commission. Map data © OpenStreetMap contributors (ODbL).