Where is Mersea Island? A complete guide to getting there
Mersea Island is a small, tidal island off the Essex coast, just south of Colchester. It sits where the River Blackwater meets the River Colne, joined to the mainland by an ancient causeway called The Strood. At high tide, the road floods, so for a few hours twice a day, Mersea genuinely becomes an island.
It’s the most easterly inhabited island in the UK, measuring five miles by two, and home to two villages (West Mersea and East Mersea) plus a handful of holiday parks including our own at Waldegraves.
This guide covers where Mersea Island actually is, how to get to it from various directions, what to know about the tide before you travel, and a few practical things first-time visitors usually ask. We’ve been welcoming families to the island for over 70 years, so we know exactly what trips people up before they arrive.
Key takeaways
Mersea is in Essex, just south of Colchester: Around ten miles south of the town, in the north-eastern corner of the county.
There’s only one road in: The Strood causeway, which floods at high tide. Always check tide times before you travel.
It’s roughly an hour from London: About 75 miles from central London via the M25 and A12, allowing for traffic.
The island is five miles by two: Small enough to walk across in a day, large enough to spend a week exploring properly.
Waldegraves is on the east side: Look out for the brown and cream tourist board signs after crossing the Strood.
The short answer
Mersea Island is in the north-eastern corner of Essex, around ten miles south of Colchester and accessed via the B1025 from the mainland. The only road on or off the island is The Strood, a causeway that floods at high tide for about an hour or two each side of high water. Allow a little extra time, check the tide times before you set off, and you’ll arrive without trouble.
Where exactly is Mersea Island?
Mersea sits at the point where two Essex rivers meet the sea: the River Blackwater to the south and the River Colne to the north. To the north of the island is mainland Essex (with Colchester ten miles away). To the south is the open estuary and, eventually, the Kent coast across the Thames.
It’s the most easterly inhabited island in the United Kingdom. There are smaller, uninhabited islands further east, but Mersea is the last one with permanent residents, villages, shops, pubs, and full road access.
There are two villages on the island. West Mersea, on the south-west coast, is the larger of the two and where most of the shops, cafes, fishing boats and pubs are. East Mersea is quieter, more rural, and home to Cudmore Grove Country Park and our holiday park at Waldegraves.
How big is Mersea Island?
The island measures roughly five miles long by two miles wide. You can walk across the whole thing in a day if you’re keen, with the full coast-path loop coming in at around 21 kilometres. By car, the journey from one end to the other takes about ten to fifteen minutes.
That size matters because it’s small enough to feel like a self-contained little world, but big enough that a week’s stay never feels short of things to do. There’s countryside, beaches, two villages, nature reserves, restaurants, sailing, fishing, walking, and a working causeway that turns into a daily event.
How do you get to Mersea Island?
There’s only one road on and off the island: the B1025, which crosses The Strood causeway from the village of Abberton on the mainland.
Driving from London
From central London, the route is M25 (junction 28) onto the A12 north towards Colchester. Leave the A12 at the junction signposted for the B1025 / Mersea, then follow the road south through Layer de la Haye and across The Strood. The drive is around 75 miles and usually takes about 90 minutes outside rush hour.
Driving from the M25 / Essex area
Once you’re on the A12 heading north, the B1025 turn-off is well signposted. From the Chelmsford area, the drive takes about 45 minutes. From the Southend area, allow an hour.
Driving from Colchester
From Colchester it’s a 25-minute drive south on the B1025. The road takes you through Layer de la Haye and Abberton, past Abberton Reservoir, then over the Strood and onto the island.
Driving from further afield
Coming from the north or west, head for the A12 and follow the route as above. From the Midlands, you’re looking at around three hours; from the north of England, considerably longer. The drive itself becomes part of the holiday once you turn onto the B1025, the road narrows, the landscape opens up, and you can feel the coast getting closer.
By public transport
There’s a regular bus service (the 67 from Colchester) that runs across the Strood to West Mersea. It’s a manageable journey for foot passengers, although connecting to East Mersea requires either a longer walk or a taxi from the village. Most visitors come by car simply because there’s so much to explore once you’re on the island.
By sea
If you happen to be sailing, Mersea has working marinas at West Mersea Hard and a foot ferry connects the east of the island to Brightlingsea in summer. It’s not a practical way for most visitors to arrive, but it’s a lovely way to leave or to visit nearby Brightlingsea for the day.
Pro tip: If you’re driving with sat nav, the postcode for our holiday park is CO5 8SE. The What 3 Words address is ///prickly.teardrop.rift. Once you’ve crossed the Strood, look out for the brown and cream tourist board signs to Waldegraves, second turning to the right.
What is The Strood and why does it matter?
The Strood is the causeway that connects Mersea Island to the mainland. It’s about 800 metres long, a single stretch of B-road across what becomes saltmarsh at low tide and open water at high tide. It’s been the only road link to the island for centuries; archaeologists have dated parts of it to the Roman period.
Here’s the part that catches first-time visitors out. Twice a day, at high tide, the Strood floods. The road becomes impassable for around an hour or two each side of high water, depending on tide height. During that window, the island is genuinely cut off.
This usually happens when the tide is 4.90 metres or above. Smaller tides may only reach the lower parts of the road, larger spring tides can submerge it completely. The tide tables are published locally and online, and our reception team can always tell you what to expect during your stay.
Don’t try to drive through flooded sections. Cars get caught out every year, the saltwater damages engines and electrics quickly, and recovering a stranded vehicle is expensive and slow. If you arrive and the Strood is covered, the simplest thing is to wait it out at a nearby pub or cafe; an hour or so usually does it.
What should you know before you set off?
Three quick things make for a smooth arrival:
- Check the tide times for the day of your travel. The tide tables are easy to find online (search “Mersea tide times”), or call us and we’ll happily check for you.
- Build in a bit of extra time. If you’re arriving during a high tide window, allow up to 90 minutes either side to be safe.
- Don’t rely on sat nav for the Strood. The road is there year-round, but sat nav doesn’t know whether it’s underwater right now.
Other than the tide, the journey itself is straightforward. There are no tolls, no ferries to book, and parking on park is free at Waldegraves once you arrive.
Frequently asked questions
Where is Mersea Island in Essex?
Mersea Island is in the north-eastern corner of Essex, about ten miles south of Colchester. It sits where the rivers Blackwater and Colne meet the sea. The only road access is via the B1025 across The Strood causeway.
How long does it take to get to Mersea Island from London?
Driving from central London takes around 90 minutes, depending on traffic. The route is M25 to A12 north towards Colchester, then the B1025 south to the island. Total distance is around 75 miles.
Is Mersea Island connected to the mainland?
Yes, by a single road called The Strood, which is around 800 metres long. At high tide the causeway floods and the road becomes impassable for an hour or two. The rest of the time, getting on and off is straightforward.
How big is Mersea Island?
Mersea Island is roughly five miles long by two miles wide. The full coast-path loop is around 21 kilometres, which is a long but manageable day’s walk. By car, you can drive end-to-end in about fifteen minutes.
Why does the Strood flood?
The Strood is a low causeway built across what was originally tidal saltmarsh. When the tide rises above around 4.90 metres, water covers the road. Larger spring tides flood it more deeply. It’s been like this for centuries and is part of what gives Mersea its identity as a true island.
Can you get to Mersea Island when the tide is in?
No, not by road. When the Strood is flooded, the island is genuinely cut off for an hour or two each side of high tide. The simplest approach is to check tide times before you travel and plan around them. If you arrive during a flooded window, wait it out at a local pub or cafe in Abberton or Layer de la Haye.
Is there a postcode for Mersea Island?
The whole island falls under the CO5 postcode. For our holiday park at Waldegraves, the full postcode is CO5 8SE. West Mersea village uses CO5 8 codes, East Mersea uses CO5 8.
How do I get to Mersea Island without a car?
The 67 bus runs from Colchester to West Mersea regularly throughout the day. From West Mersea you can walk, taxi or cycle to other parts of the island. Most visitors come by car because there’s so much to explore once you’re on the island, but it’s perfectly possible without one.
Where is the best place to stay on Mersea Island?
Waldegraves offers self-catering caravans, lodges, and touring pitches with full facilities on site. For families and groups, a holiday park stay tends to work out cheapest and most flexible.
Is Mersea Island worth visiting?
If you like coastal Essex, fresh seafood, quiet beaches, walking and a slower pace, yes. It’s one of the most distinctive small islands in the UK, with a genuine sense of being away from the mainland even though you’re only a short drive from Colchester. It suits families, couples, walkers, fishermen and food lovers.
Plan your visit to Mersea Island
Now you know how to get here, here’s how to plan the rest of the trip. Have a look at our area guide for what to see and do during your stay, or browse our holiday options if you’re thinking about a longer break on the island.
