Where was Open Water filmed?

Filming locations

• Towns & cities United States Virgin Islands United States Unincorporated territory of the United States of America

  “As noted above, the real-life events that inspired this story took place in the southern Pacific Ocean, and this film moves the location to the Atlantic Ocean, being filmed in The Bahamas, the United States Virgin Islands, the Grenadines, and Mexico.” Wikipedia

Also per Wikipedia's Production section

Wikipedia’s Production section names 1 more place. Each links to the sentence that says so.

Recorded only at country level

Also filmed in The Bahamas, but the exact places are not known, so they are not on the map.

Its Wikipedia article also says it was filmed in Mexico, without naming a place, so it is not on the map.

Also shot in these places