Arenzano is a coastal town and comune in the Metropolitan City of Genoa, Liguria, northern Italy, facing the Ligurian Sea. As of 2017, it has a po…Arenzano is a coastal town and comune in the Metropolitan City of Genoa, Liguria, northern Italy, facing the Ligurian Sea. As of 2017, it has a population of 11,445. This varies during the holiday seasons due to tourist flow.