Neum is a town and municipality in Bosnia and Herzegovina, located in Herzegovina-Neretva Canton of the Federation of Bosnia and Herzeg…Neum is a town and municipality in Bosnia and Herzegovina, located in Herzegovina-Neretva Canton of the Federation of Bosnia and Herzegovina. It is the only town on the Bosnia and Herzegovina coastline, making it the country's only access to the Adriatic Sea. As of 2013, Neum municipality has a population of 4,653 inhabitants, while the town of Neum has a population of 3,013 inhabitants.