The Pennine Way turns left off the A689 on a side road in Slaggyford, then bears right of the old Methodist chapel (now a bed-and-breakfast) and heads along a lane beside damp fields of marsh marigolds. The old Alston–Haltwhistle branch line, which closed in 1976, is down to the left. The route descends through some attractive woodland, awash in their season with wild flowers such as primrose, wood anemone, early purple orchid and wood cranesbill. After crossing a footbridge, the path goes under the railway embankment, and across a field to Merry Knowe.

The route is confusing here, as is so often the case around working farms. Go through the gate and then, keeping close to the wall on the right at first, cross three stone stiles. This brings you out again on to pasture and, although there is no clear path to follow, route-finding is quite easy. Go through a small gate and over several stiles, crossing a minor road diagonally left before more field walking drops you towards the viaduct at Burnstones. Just before the viaduct, drop down to the Thinhope Burn and go under the first arch of the viaduct and out on to the road.

Go left along the road to pass back under the viaduct and then go through the gate on the other side of Knarsdale Hall’s driveway to head diagonally up a field and on to the shoulder of a wide expanse of open moorland. The dome of moorland to the left is Glendue Fell, part of Geltsdale. After following the shoulder of the moor for a mile (1.6km), the path drops down to cross the pretty Glendue Burn.

After the footbridge, the route climbs again to contour the side of another dome of dark moorland at the edge of Hartleyburn Common. The route shadows the Maiden Way and the distant views are excellent; east over the wooded South Tyne Valley to Ashholme Common and Whitfield Moor, and south to the plateau summit of Cross Fell, which is the highest ground in England outside of the Lake District.

The A689 is crossed just west of the village of Lambley, the path turning left on the descent to the road to cut off the corner and minimize road-walking. After crossing the road, the Pennine Way heads northwest over boggy ground with no obvious path at first, past old mine workings and seeking the higher ground via hummocks and ridges to a derelict barn at High House. Swinging northeast, Hartley Burn is then crossed at a footbridge and, after following the burn as it angles left, a grassy path climbs out of the valley and leads through green pastures to Batey Shield. Walk between the first set of buildings and to the right of the farmhouse to head downhill beside a field boundary on the left.