Between Cuban provinces , Matanzas is one of the most industrialised , with petroleum wells , refineries , supertanker facilities , and 21 sugar mills to process the harvests of the fields of sugarcane in the province .
Of Cuba 's provinces , Matanzas is one of the most industrialised , with petroleum wells , refineries , supertanker facilities , and 21 sugar mills to process the harvests of the fields of sugarcane in the province .