Cliff Falls and Path Diversions: Walking a Coast That Keeps Moving

A coastal path can feel timeless, yet the coastline beneath it is anything but fixed. Waves, rain, wind and frost are constantly at work, and in some places the cliff edge moves back a little every year. Occasionally it moves a lot in a single night. Understanding why this happens makes diversions less frustrating and helps you stay safe.

Why coasts erode

Coastal erosion is a natural process. Waves undercut the base of a cliff, rain soaks into the rock or soil, and frost opens cracks. Eventually the material above loses support and falls or slides. How quickly this happens depends on what the cliff is made of:

Hard rock, such as granite or some limestones, tends to erode slowly, though it can still shed blocks.
Soft rock and clay, common on parts of the east and south coasts, can slump or slide, especially after heavy rain.
Glacial deposits of sand, gravel and clay, found in some places, are loose and can retreat quickly.

Storms, high tides and wet winters speed things up. Over time, this changes the shape of the land and the route of the path.

Why paths are diverted

When a section of path is lost to a landslip or becomes too close to an unstable edge, the managing authority or landowner will often close it and set up a diversion inland. This protects walkers and allows the path to be moved to a safer line. Some diversions are temporary, while others become permanent when the cliff has moved for good.

On long-distance coastal routes, trail teams keep websites and social media pages with updates on closures, so a quick check before you set out can save a long detour. Local councils and national park authorities also publish updates.

Reading the signs on the ground

Diversion signs are usually clear, with arrows pointing the new way, and sometimes with a map. A few reminders:

Treat fences and barriers as real limits, not suggestions. They are placed there for a reason.
Do not follow worn tracks that go around a closure. They often lead onto unstable ground.
If a diversion looks long, check the map for the safest alternative rather than taking a shortcut.

Keeping a safe distance

Even on open paths, cliff edges can be unstable. Overhanging turf may look solid but have nothing beneath it. Some simple habits help:

Keep well back from the edge, particularly in wet weather or after a storm.
Keep children and dogs close, and consider a lead near edges.
Never walk or sit at the base of a cliff, where falls can happen without warning.
Pay attention to fresh scars, cracks or slumps along the path, which can signal that the ground is moving.

Our guide to walking the coast path safely covers tides, cliffs and weather in more detail.

The beach below

Beaches beneath eroding cliffs can be rewarding places to look for fossils and pebbles, but they come with risks. Falls may happen at any time, and a rising tide can cut off your retreat. Check tide times, stay well away from the base of cliffs and do not dig into the cliff face.

Why it matters beyond the path

Eroding cliffs are part of a wider story about how coastal communities adapt. Some stretches are protected with sea defences, while others are allowed to change naturally. Walking these coasts is a chance to see the process at work, and to appreciate why paths are sometimes moved rather than held in place.

Planning around the unexpected

Build in extra time for a diversion, particularly in winter. If you are relying on a bus or a train from a coastal town, our article on reaching trailheads without a car can help you plan so that a detour does not mean a missed connection.

Frequently asked questions

Is it safe to walk close to the cliff edge? It is safest to keep well back. The ground near the edge can be undercut and may give way without warning.

Why is the path closed when it looks fine? The problem may be hidden, such as cracks or voids beneath the surface. Closures are made on the advice of people who monitor the ground.

Can I collect fossils on the beach? Rules vary by site, and some places are protected. Check local guidance, take only loose finds from the beach and never dig into cliffs.