The Ulster canal was built in in the mid 19th century across the north of Ireland, linking Lough Neagh in the east with Lough Erne in the west. Like most canals, it fell into decline with the arrival of the railways. Partition in 1922 was the final nail in its coffin, and all 46 miles closed completely in the 1930s. Now there are plans to re-open a cross-border section of the canal between County Armagh and County Monaghan - an idea which was mentioned specifically in the Good Friday Agreement.

In this programme Helen Mark retraces the ghost of the route of the old canal - easy to see in some places, hidden beneath decades of ivy and tangled undergrowth in others. In the village of Benburb, she meets author and enthusiast Brian Cassells, who tells her about the history of the canal and paints a picture of what restoring it could mean. On the other side of the border, she visits the Ulster Canal Stores at Clones, where canal restoration work has already started. Stores manager Hugh Tunney describes re-opening the canal as a "game changer". He's hoping it will bring much-needed infrastructure for boaters and paddleboarders, attracting tourists and generating more income for the area.

At Lough Neagh, Helen meets up with a group of canoeists, who tell her that reviving the Ulster canal would open up whole new possibilities of routes for them to use - linking this area of the island with other existing waterways. At the other end of the canal, she tries her hand at rowing a traditional Irish currach on Lough Erne, under the guidance of skipper Olivia Cosgrove. Could the Ulster canal be the missing link in the extensive network of waterways which criss-cross the island of Ireland?

Presented by Helen Mark and produced by Emma Campbell