A revetment or training wall extending for some 2400m along the northern edge of the River Dee channel. The wall is annotated 'Stone Causeway' and is signposted to mariners with a perch as its western end. The wall abuts to the foreshore at its eastern end.

Sources include:
CPAT, 1997, Coastal Survey: Rhos-on-Sea to Saltney
Historic Chart 1170B-A2, RCAHMW Digital Collections sourced from the UK Hydrographic Office (published 1873).

Maritime Officer, RCAHMW, October 2011.