Presenter Joe Mahon visits the town of Warrenpoint in southern County Down. Joe tells of how the area around Warrenpoint in Carlingford Lough was formed by the ice age and how it was developed in recent times as a busy port. Peter Conway takes Joe out by boat onto the lough and talks him through recent developments in the expansion of the port.

Joe visits the historical site of the coronation stone of the Clann MacGuinness. He meets Lisa Hall, the current owner of the sprawling Narrow Water Castle who gives him a tour of the rooms and a climb up to the top of the tower for commanding views of the town and countryside. Mairead, Hugh, Declan and Cathal McAnulty talk to Joe about their family history of providing both horse drawn transport and undertaking to the town community.

Peter Fitzsimmons looks down on Warrenpoint from Flagstaff Mountain and tells Joe about the arrival of mass employment in the town when an American cardboard company set up a factory. Joe to speaks to Brian Cunningham on his boat which he uses for mussel dredging, a big part of the local fishing industry. Barry Fox of the Loughs Agency explains to Joe the importance of monitoring the water quality in Carlingford Lough and Ciaran McGonigle shows Joe the hi-tech scientific equipment on his boat used in this while explaining the science behind the healthy local ecosystem.

Lesser Spotted Ulster is a long-running and popular programme that visits the places many of us have heard of but never been to. Presenter Joe Mahon gently explores what makes a place what it is.