Sail Liath, An Teallach, Sgur Fiona and Bidein a' Ghlas Thuill Loop

This is a serious mountain day on one of the finest ridges in the Northwest Highlands: about 16 km / 10 miles with roughly 1,300 m / 4,265 ft of ascent, sustained steep climbing, rough ground, exposure, and sections where route choice matters as much as fitness. The loop links Sàil Liath, Sgùrr Fiona, and Bidein a’ Ghlas Thuill on An Teallach, a mountain famed for its dramatic sandstone architecture and for terrain that can feel much bigger than the mileage suggests. The usual access point for this circuit is the Corrie Hallie parking area on the A832 near Dundonnell, Wester Ross, a small roadside parking area west of Braemore Junction and east of the Dundonnell settlement. (getlostmountaineering.co.uk)

The day typically begins on estate tracks and stalkers’ paths before steepening onto the long southeastern shoulder of Sàil Liath. Early ground can be deceptively straightforward, but the route soon turns into a proper mountain outing with loose stone, eroded path, and long stretches where progress slows. If visibility drops, this is not a ridge to underestimate; the broad lower approaches give way to much more complex terrain higher up, so careful navigation with HiiKER is worthwhile well before the scrambling ground begins. (walkhighlands.co.uk)

What the route feels like

Climbing Sàil Liath first is a logical way to tackle the loop because it gets the long ascent done early and sets up the ridge traverse toward the two Munros. The pull onto Sàil Liath is steep and often loose underfoot, especially on the upper descent/ascent lines where scree and stony ground can shift. From the crest, the character of the walk changes completely: the ridge opens into huge views over Coire Toll an Lochain, the Summer Isles, and the wider Torridonian landscape, while the line ahead becomes much more rugged and committing. Walkhighlands specifically notes the descent from Sàil Liath as loose scree, which is useful to bear in mind if you are considering direction of travel. (walkhighlands.co.uk)

From Sàil Liath the traverse toward Sgùrr Fiona and Bidein a’ Ghlas Thuill is the visual and physical heart of the outing. Bidein a’ Ghlas Thuill, at 1,062 m / 3,484 ft, is the highest point of An Teallach, while nearby Sgùrr Fiona reaches 1,060 m / 3,478 ft. Between and beyond them, the ridge narrows, rises in rocky steps, and demands attention to hand placement, footwork, and escape options. Some sections can be bypassed, but this is still a difficult mountain route rather than a simple hill path. (walkhighlands.co.uk)

Scrambling, exposure, and key hazards

The most important planning point is that An Teallach is famous not just for height and scenery, but for exposure. The ridge between Bidein a’ Ghlas Thuill and Sgùrr Fiona can be followed directly with scrambling, or in places eased by using bypass paths on the northern or western flanks. Beyond Sgùrr Fiona, the ground around Lord Berkeley’s Seat and the Corrag Buidhe pinnacles becomes more serious. Walkhighlands notes that the final descent off Corrag Buidhe is a graded rock climb and has been the scene of fatal accidents, and advises that parties who go that far may need to retreat slightly to locate the bypass path on the right-hand side of the ridge. (walkhighlands.co.uk)

That means preparation should focus on more than distance and ascent. Hikers should be comfortable on steep, rocky, exposed terrain; able to reverse short sections if needed; and realistic about weather. Wind, rain, or wet rock can change the feel of this route dramatically. In cloud, the bypass lines and descent choices become much harder to judge. For many parties, this is a route best saved for a stable forecast, dry rock, and long daylight. (walkhighlands.co.uk)

The descent back toward Corrie Hallie is not a casual finish either. From Sàil Liath, the ridge drops on stony, loose ground before meeting the stalk