Resumen
The Catalan Atlas [1375] attributed to Cresques Abraham, jew buixoler, is preceded of a long geographical, astrological and oceanographic text, a part of which refers to the tides and is accompanied of the most ancient graph that is known, of 14 circumferences and 16 orientated sectors. It has been identified the toponyms and we discuss the sources of the theories of the establishment of ports and of the texts (Isidorus, Honorius d¿Autun or of Regensburg) and the classic roots of the theory.
