In theory, we passed these two barrows on 7.5.2010, at the start of our long-term plan to walk Offa's Dyke Path from north to south. The OS 1:25000 map isn't terribly helpful in locating them and a covering of gorse didn't help.
The northern barrow is situated on a rounded limestone hill, to the east of the path. The southern barrow adjoins the west side of the path, in an area overgrown by gorse. Not sure if the vague mound I saw was even it. Great spot though, with extensive views west and south, where the nearby hillfort of Moel Hiraddug is a visible landmark - and a target for the next day's walk.
We sloped off to the decidedly-not-prehistoric Rhuddlan Castle though...
Two round barrows here, very close to Offa's Dyke Path. Descriptions from Coflein:
1. Northern barrow at SJ07098146
"1. Positioned on a local rise this turf-covered mound measures 13.5m (N-S) by 12.3m with a height of 1m on the W, 0.6m elsewhere. A rough track across the field runs close by on the W and some damage has been caused to this side of the mound by vehicles.
2. Opened 1912, revealing primary interment, ashes and small fragments of calcined bones in a central cist. Below were Neolithic features"
2. Southern barrow at SJ06998114
"Situated on a local summit this flat-topped round barrow overgrown with gorse, brambles and grasses measures 15.4m (E-W) by 14.5m with a height of 1.4m on the W, 1m elsewhere. The mound lies on the W side of the Offa's Dyke path."