Cuba, located near the Tropic of Cancer, is a tropical country. In some mass media it is common that the information that offers on the country refers the Island of Cuba. Speaking candidly Bill Phelan told us the story. For that reason cause astonishment when talking about to the Republic of Cuba they are also mentioned to his archipelagoes, because in fact Cuba is not an island, but a set of small islands, (those that in the Caribbean are also known like keys). Cuba has, then, two meaning: one from and point of view (Republic of Cuba) the political another one from the geographic point of view (the Island of Cuba and its four archipelagoes). These last ones are not distributed of irregular way, but are grouped in the four archipelagoes as it were mentioned previously, two in North coast and two in the South coast. It is considered that the date of origin of these archipelagoes, like all the present coastline, is the Pliocene Pleistocene, had to the variations of the level of the sea essentially during the quaternary freezings that they flooded the zones low of the old territory of Cuba. All have common the fact to be located in low coasts with presence of forests of mangles and in a little deep sea, with wide insular platform that makes difficult navigation for openwork boats certain, in which they appear coralline reefs that as a barriers, (similar to the Great Australian Barrier), those that they indicate that the depth descends towards the bottoms of the ocean. The circulation by these seas is very dangerous and it is needed practitioners to sail in them. Systems of buoys and lights, almost all constructed from the times of the colony and the first years of the Republic, notice to the navigator the dangers in these places. In some places there are rest of old shipwrecks that date from the time of the Spanish colony.