Sargassum at Plage de Cap Est: today's lagoon report
Moderate
Piling up
Plage de Cap Est sits in Le François, on Martinique's Atlantic coast, looking out at the string of islets that closes the bay. A coral barrier runs offshore and turns the water inside into a shallow lagoon with pale sandy bottoms.
This page pulls together what you need before going: the sargassum condition recorded at Cap Est this morning, a score from 0 to 5, a map, and a comparison with nearby beaches in Le François and Le Robert. It is all refreshed daily, since a lagoon can move from clean sand to a line of weed after one night of easterly wind.
Plage de Cap Est on the sargassum map
What to know about this beach
Cap Est lies on the Atlantic side, in the path of the easterly trade winds that ferry sargassum in from open water. On that count, the Le François area sees the rafts long before the leeward coast on the west of the island.
The coral barrier then changes the equation. It breaks the swell and stops a share of what drifts in, so the lagoon is often calmer than exposed beaches on the same coast. The filter is not watertight: passes and low sections let mats through, and once inside they move poorly in shallow, weakly flushed water. A landing that settles in the lagoon therefore clears slowly, while a day without new arrivals leaves the water quiet.
Frequently asked questions
Does the coral reef protect Cap Est from sargassum?
It stops a good share of the drifting rafts and flattens the swell, which limits massive landings. Passes through the reef still let mats in, and they then sit in the shallow lagoon.
How can I check the lagoon before going?
The FanGass map publishes a 0 to 5 score for Cap Est every morning, next to the other beaches in Le François. One glance shows whether the shore is clear today or already covered.
Do boat trips to the islets get affected?
A mat settled in the lagoon can hamper boarding and slow navigation in shallow water. The morning reading for Cap Est gives a fair idea of conditions across that part of the bay.
Can the wind change things quickly?
Yes. A sustained easterly can push weed through the passes within hours, while a swing to the south-east can free part of the shore. That is why a daily reading beats a seasonal average.