Field notes · № 02 · 5 min read
End of the road
The Marquesas are 25 miles past Key West. Here's the run, the anchorage, and what to wear.
Apr 10, 2026
US-1 ends in Key West, at the corner of Whitehead and Fleming. Mile Marker 0. The road, in the official sense, stops there. But the Keys do not. They keep going west — Boca Grande, the Marquesas — for another 25 nautical miles in the sailor's sense, before the chain finally relaxes into open Gulf at the Dry Tortugas.
The Marquesas are the closest thing to a true atoll the continental U.S. has. A roughly circular ring of mangrove islets, broken on the south side at Mooney Harbor — a deep cut where you can drop the hook in fifteen feet of water inside the lagoon. From the air, it looks like a target. From the deck of a boat, it looks like the end of the world.
The run
From Garrison Bight in Key West, plan three hours. You leave the harbor heading west-northwest, pass Tank Island and Wisteria, point your bow at Boca Grande Channel, and get a feel for the open water. The Gulf side of the Marquesas is shallow — most of the run is in 12 to 25 feet — but expect 2 to 4 foot wind chop on the regular. If you are not used to running 25 miles in a flats skiff, take the time to learn.
At Boca Grande, there's a fork: north into the back side of the Marquesas, or south outside the atoll into the deeper Gulf approach. North is faster but tighter; south is rougher but safer if the wind has picked up.
The anchorage
Mooney Harbor is the move. Enter from the south through the only navigable cut in the ring, drop the hook just inside, and you are anchored in a closed lagoon with mangrove islets at every compass point. There is a single Conch Pink navigation-light marker at the harbor entrance — the same dot we put on the back of the Marquesas Tee. It blinks at night. You can see it from the deck. The water inside the harbor is glass.
What to wear
- — Reef Tract Long-Sleeve, hooded variant — the run home is straight into the afternoon sun.
- — Reef Tract Sun Mask — pulled up over the nose during the worst of it, dropped at anchor.
- — Marquesas Tee — when you make it back to dock that night and the bar at the Half Shell is calling.
“End of the road. End of the chart. End of the line.”
If you have not been to the Marquesas yet — go. Plan the day, watch the weather, leave at sunrise, anchor at noon, run home in the gold. It is the trip that explains the brand.