Tidal Walks and Getting Cut Off by the Tide

Ireland has some of the best low-tide walking in Europe: tidal islands like Omey and Coney, and strands that dry for a kilometre or more in Dublin Bay, Dundalk Bay and Sligo Bay. Every year people are cut off on them. Nearly always the walk was fine; the timing of the return was not.

Why people get caught

The tide does not creep in evenly. By the rule of twelfths it rises slowly for the first hour after low water, then speeds up. On a big spring in Dublin, with a range of about 3.7 m, the middle two hours of the flood each raise the water by close to a metre. Across flat sand that slopes 1 in 500, a metre of water moves the edge about 500 m inland. That is still slower than walking pace. The trouble is where the water arrives first.

Strands are not flat. They are crossed by gullies, channels and low patches that fill from the side or from behind while the sand you stand on is still dry. A walker heading out at low water sees dry sand ahead. Turning back an hour later, there is a knee-deep channel running fast between them and the shore. Add soft sand, fog, a dog that ran off or a sunset that made everyone linger, and the margin is gone.

Spring tides make all of this worse. Low water goes out further, so you walk further, and the flood comes back faster. Check the spring and neap dates before a long walk.

A simple timing rule

Find low water for the nearest gauge on our site. Note whether it is a spring or a neap.
Set out on the falling tide, an hour or so before low water.
Turn for home no later than low water, and be off the sand within an hour after it.
On a spring tide, in fog, or when the place is new to you, give yourself more margin, not less.

Our beach and station pages show the daylight window around each low water for the coming week. That is the window to plan in. It is not a guarantee the crossing is open: wind and swell can hold water on a strand.

Omey Island, Co. Galway

Omey lies off Claddaghduff, north of Clifden. When the tide is out a wide strand joins it to the mainland, and you can walk across in about 15 minutes or drive on the signposted route. Galway Tourism’s advice is to cross only around low tide, keep to the markers and check the tide first.

Clifden RNLI is still called out regularly. In May 2024 its crew rescued a family of six, including a three-month-old baby, cut off on the island. In August 2025 it brought seven people back to Claddaghduff. The helm’s advice after the 2024 rescue was to check tide times and heights before going, and if you are cut off, to stay where you are rather than try to return alone.

Coney Island, Co. Sligo

Coney Island is reached across Cummeen Strand from near Strandhill, along a line of 14 stone pillars put up in the 19th century after drownings on the strand. The crossing is about 2.5 km. The tide gauge is Sligo.

The RNLI set up a free text service in 2016 after repeated cut-off incidents: text CONEY to 51155 from an Irish mobile (81400 from the UK) for the safe crossing times that day. Use it as well as the tide table. The RNLI’s own advice is to always leave extra time to return, and never to start across if there is water on the strand. Keep to the pillar line: the sand on either side is soft and claims cars.

The big strands

Dublin Bay. At a spring low the sand off Sandymount and Dollymount dries for a kilometre or more. The flood returns through the channels first, and walkers on the outer banks off Sandymount and around the tip of Bull Island are the ones who get caught.
Dundalk Bay and the Boyne. One of the shallowest bays on the east coast, drying for miles. Superb for birds, unforgiving at anything but low water. Laytown’s strand races are timed to the tide for good reason. Gauge: Clogherhead.
Inch and Rossbeigh, Co. Kerry. Two sand spits facing each other across Castlemaine Harbour. The channel between them carries the whole harbour in and out twice a day. Walk the spits, but stay away from their tips. See Inch and Rossbeigh.
Dungarvan Harbour. Almost the whole harbour dries at low water and the Cunnigar spit is a known cut-off point. Gauge: Dungarvan.

If you are cut off

Stay calm and move to the highest ground you can reach: a sandbank, rocks or the island itself.
Call 112 or 999 and ask for the Coast Guard. Tell them where you are and how many people.
Do not wade or swim back through a channel. It may be deeper and faster than it looks.
Carry a charged phone in a waterproof bag, and tell someone ashore your plan and your return time.

The tide table guide explains how to work out the height at any time between high and low water.

When is it safe to walk to Omey Island?

Around low water only. The strand from Claddaghduff is uncovered for a few hours either side of low tide. Check the Clifden low water time before you go, follow the marked route, start across on the falling tide and leave the island well before the flood comes back.

How do I get safe crossing times for Coney Island in Sligo?

The RNLI runs a free text service: text CONEY to 51155 from an Irish mobile (81400 from a UK mobile) for that day’s safe crossing times. Stay on the line of 14 stone pillars across Cummeen Strand and never start across if water is on the strand.

How fast does the tide come in?

In the middle hours of a big Dublin spring tide the water rises close to a metre an hour. On very flat sand that moves the edge forward several hundred metres an hour. The real danger is that gullies and channels between you and the shore fill first.

What should I do if I am cut off by the tide?

Stay where you are, on the highest ground, and call 112 or 999 for the Coast Guard. Do not try to wade or swim back through the channel. The RNLI crews who rescue people on Omey say that trying to get back alone is when people get into trouble.