Cuba

Cuba is an insular nation in the Caribbean.

X-Men: First Class
In 1962, the Cuban Missile Crisis happens after Sebastian Shaw convinces the Soviet premier to send nuclear missiles to Cuba. American President Kennedy institutes a blockade around Cuba to prevent the soviet union from shipping Nuclear warheads. Shaw travels with the Russian fleet to ensure that the missiles get to Cuba. Xavier, MacTaggart, Lensherr and the rest of the team fly to the blockade to stop the fleets from engaging.

Trivia
The Cuban beach was actually shot in Jekyll Island, Georgia.