Mariel is a municipality and town in the Artemisa Province of Cuba. It is located approximately 40 kilometres west of the city of Havana. The t…Mariel is a municipality and town in the Artemisa Province of Cuba. It is located approximately 40 kilometres west of the city of Havana. The town is situated on the south-east side of the Mariel Bay. The villages of La Boca, Henequen, Mojica, Quiebra Hacha, and Cabañas are the major settlements composing the municipality of Mariel.