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40 Canons is a boat accessible salt water dive site, located in Mahahal-Costa Maya, Quintana Roo, Mexico. This dive site has an average rating of 4.33 out of 5 from 3 scuba divers. The maximum depth is 141-150ft/43-46m. The average visibility is 91-100ft/28-30m. This dive site provides bathrooms and airfills.

The diving is on the magnificent Meso-American Barrier Reef System, the largest barrier reef system inthe Northern Hemisphere. This reef runs is 900 kilometres long, stretching from Cozumel in the north toHonduras in the south. Parts of the reef are between 2 and 4 million years old.

The amazing section of the reef fringing the Costa Maya is typified by the finger formations, which createcanyons and swim-throughs. There are two corridors of concentrated reef in Costa Maya. The first begins at the surface and is amazingly visible from the entire shoreline. This slopes down to around 15m/50ft at around a 45 angle, and then plateaus. There is then a break in the reef. A sandy platformthen separates the two corridors of reef. The second corridor starts off at around 15m/50ft and stayslevel before a sloping wall begins. This wall slopes down at around a 45 angle, until the vertical drop offat around 50m/165ft, which then plummets to an estimated 2000m/6600ft.

Typically in this area, there is a very slight current to the north, which makes for easy diving. Most divesites are suitable for beginners and/or experienced divers. Visibility averages 25m/80ft, and watertemperature averages 27C/78F.

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