Bogs, tussocks and the ground that steals hours

What follows is the working version of difficult terrain: the decisions in the order you actually meet them, with the reasoning attached.

Speed is a surface property

A map records gradient and distance and says nothing about whether the ground is firm, tussocky or saturated. Deep heather, tussock grass, blanket bog and boulder field can each reduce pace to a half or less of path speed. A five-kilometre section can therefore take anything from an hour to three.

The cost is in effort as much as in time, because every step onto uneven ground calls on stabilising muscles a path never asks for, which is why an hour of tussock leaves people more tired than two hours of track.

Predicting it before you go

Aerial imagery shows surface texture clearly and is the single most useful planning tool for pathless ground. Land cover mapping distinguishes bog, heath and grassland at a useful scale in many countries.

The detail that matters: combining that with the contour map gives a realistic time estimate rather than an optimistic one. Season transforms the same ground, since a hard frost makes blanket bog quicker to cross than any path while a thaw makes it worse than either, which is why some pathless routes are winter propositions rather than summer ones.

Lines that work

Sheep and deer tracks follow the driest, most efficient line and are usually worth following even when they deviate. The edges of watercourses often drain better than the surrounding ground.

Higher ground on a spur usually beats the flat basin beside it, contours notwithstanding. The boundary between two vegetation types is often the best line of all, because a change from rush to heather usually marks a break of slope where the ground drains, and following that edge keeps you on the firm side of it.

Tussocks are worse than they look

Walking on tussocks is unstable and walking between them is deep, so neither option is efficient. They also conceal holes and hide ankle-turning ground, making the terrain a genuine injury risk rather than merely slow.

This is the terrain where poles pay for themselves most obviously. What helps is slowing down and committing to each tussock top rather than hurrying between them, because the injuries come from a foot arriving where the ground is not, and hurrying is exactly what puts it there.

Build it into the plan

Timing formulae assume reasonable ground and need a correction factor for pathless terrain. Applying a generous multiplier to off-path sections is what prevents a benighted party.

The detail that matters: experienced walkers in this ground routinely plan half the daily distance they would on paths. The escape route needs the same multiplier, because a party that has slowed to half speed getting in will not get out any faster, and a plan treating the walk out as a normal-speed retreat has its margin the wrong way round.

None of this is uniform across a country the size of most of these.

Peat hags, and the cost of walking wet ground

Where blanket bog has eroded, the surface breaks into hags and gullies two or three metres deep, which remove your line of sight, make a compass bearing hard to hold over short distances and turn a straight kilometre into an hour of climbing in and out. The bare peat between them is genuinely soft after rain, and going in to the thigh is an ordinary event rather than a freak one; the danger is less the hole than being soaked and cold a long way from shelter.

Walking saturated peat also does lasting damage, because a boot print breaks the vegetation seal and water then widens the break into a channel, which is why restoration teams reprofile hags and block gullies instead of simply reseeding them. Where a repaired path or a line of stone flags crosses bog, staying on it is the whole of the mitigation, and stepping round a wet section to keep boots clean is precisely how those sections get wider every year.

The takeaway

Look at the aerial imagery before the contours. The surface decides the day.

The route rewards patience more than equipment.