Roughly between the border with Croatia and the border with Albania, runs the Montenegro Coastal Trail. This 180 km long mountain trail with stunning view on the coast is called the Mountaineering Coastal Transversal, the Coastal Hiking Transversal or in the Primorska Planinarska Transverzala. PPT, for short.
Read this blog about hiking the PPT including maps, GPS-tracks, watersources and more. All the information one needs to hike the Montenegro Coastal Trail.