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Twice in every 24 hours Mersea has a high tide. Sometimes it creeps over the mud and onto the road, and Mersea stops being part of Essex. The Strood, the causeway carrying the B1025 across the marsh, is the only way on or off the island unless you arrive by boat, and on average it floods at high tide for about a week a month. About seven square miles, 400 beach huts, the Colchester native oyster and a Roman burial mound sit on the far side of it. So the first thing to plan here is not what to see. It is when to cross.
We at Travelmyth, the hotel search engine that ranks stays by the traveller's own interests and needs across 60 stay categories, put together this guide to things to do on Mersea Island and to the tide table that governs all of it. The island lies 9 miles south of Colchester, in the estuaries of the Blackwater and the Colne: the most easterly inhabited and publicly accessible island in the United Kingdom, and one of 43 unbridged tidal islands reachable on foot or by road from the British mainland.
The Strood carries the B1025, the Mersea to Colchester road, across the marsh, and its name comes from strod, meaning marshy land. Although the Strood is sometimes described as Roman, oak piles discovered there in 1978 were dated by dendrochronology to between 684 and 702, pointing instead to a Saxon-period origin.
Tide height decides the day. Flooding becomes likely somewhere above 4.5 m, and sooner when it is windy and the water is rough. Treat 4.5 m as the height at which you start checking properly, not a line you can cut fine.
When the road does go under, it is sometimes covered for 30 minutes either side of high water and other times for up to 1.5 hours either side, on a spring tide or in strong wind. Allow at least an hour either side of a potentially flooding high tide, and longer for particularly high tides or strong winds.
Do not drive onto a covered causeway. West Mersea Town Council advises against it because it could be dangerous and could damage your vehicle, and a breakdown out there can leave a car abandoned in the sea. In 2012, West Mersea Lifeboats complained to Essex County Council about inadequate signage after 13 people were rescued from the Strood at high tide in under 24 hours.
So check twice: when you plan the day, and before you set off. A webcam gives a live view of the crossing, and a companion website lists upcoming high tides and how likely each is to block the road. Printed tide tables are often available in local shops.
Driving, leave the A12 at junction 26, signposted Halstead and Stanway A1124, and follow the signs for Mersea Island on the B1025; from London that is under two hours, past Chelmsford and Tiptree. Straight after the Strood the road forks: right for West Mersea, its high street and jetty, left at the brown signs for Cudmore Grove Country Park at East Mersea. Sat-nav postcodes are CO5 8JE and CO5 8UE.
There has never been a railway on Mersea Island, so you cannot arrive by train. Trains from London Liverpool Street reach Colchester Station and Colchester Town Station, the latter marginally closer, with a taxi of about 20 minutes from either. Buses run regularly from Colchester to West Mersea, with service 55 the main route. At high tides, services may terminate at Peldon if the Strood is impassable.
Most parking on the island is paid, through an app at the beach car parks, and West Mersea Town Council keeps a current list of the car parks in West Mersea.
West Mersea is the island's main inhabited area and its hub, with a parish population of 7,221 at the 2021 census; East Mersea, four or five miles east, is a small hamlet, and locally the two count as distinct communities. The shops, restaurants, pubs, small hotels, library, museum and the Norman church of St Peter and St Paul are here.
The waterfront is the point of the place. The jetty and the marina are here, and the coast path leaves town past clapboard houses and oyster sheds. The crabbing pontoon on Coast Road is rated one of the best crabbing spots in Essex, and a crowd on the pontoon is not necessarily a queue.
Mersea has the largest inshore fishing fleet from Lowestoft to Brixham: sole, skate, bass and mullet in summer, herring and cod in winter. Until the turn of the century the oysters were dredged under sail, and some of those smacks, kept up by local enthusiasts, still sail here in summer.
Oysters have been harvested off Mersea since Roman times and are shipped worldwide, and shells found at the island's red hills, the remains of Celtic salt workings, point to the native oyster going back further still. Mersea is the home of the Colchester native oyster, and is itself shaped like an oyster.
Two varieties carry the name: the Colchester Native, harvested from September to May, and the Colchester Rock Oyster, available all year. Today the trade is predominantly in Pacific oysters introduced to the area, and the Essex oyster fishery is opened by the Mayor of Colchester every September.
The fishery has failed before: the severe winter of 1947 destroyed most of the stock. Oysters and shellfish are served in West Mersea's restaurants and cafes today, among them The Company Shed, a weatherboard shack that Jay Rayner and Rick Stein both raved about, long known for a bring-your-own tradition; check the current arrangements before you go.
East Mersea is the quiet end: predominantly farmland, with a 2011 census population of 266 against West Mersea's 7,183, and salt marsh where the west has cafes. Sabine Baring-Gould was Rector here between 1870 and 1881 and set his novel Mehalah: A Story of the Salt Marshes on Mersea.
Cudmore Grove Country Park takes the eastern tip, over 102 acres overlooking the point where the Colne and the Blackwater merge, with a sandy beach, grassland, bird hides, nature trails and a large children's play area. It opens daily from 8am to dusk, parking charges apply, and in the colder months it fills with wildfowl, including brent geese.
Look down as well as out. Fossils and bones of monkeys, bears and bison dating back 300,000 years have come out of the crumbling cliff, and the park holds Second World War pillboxes and a 16th-century blockhouse, fortified by Royalists in 1648 and now down to a few earthworks.
Mersea Island Museum stands in the centre of West Mersea, just east of the parish church at 12 High Street. Independent, fully accredited and founded in 1976, it covers the island's working past: fishing, oystering, wildfowling and boat building. The main-hall exhibition changes every year; the current one marks the museum's golden anniversary.
The Resource Centre's computers hold over 50,000 images along with parish records, audio and video, and there are quizzes for children and disabled access. Opening hours, admission and the summer programme of guided history walks change by season, so check the museum's current information before you visit.
The Bronze Age, roughly 2500BC to 800BC, left tools and pottery here, and between 2016 and 2019 parts of a Bronze Age board walk across the shore were found and a second Bronze Age barrow excavated, both indicating a sizeable local population. Mersea's most famous Roman relic is a mound: the Mersea Barrow, a Roman burial mound beside the East Mersea Road, and the casket found in it is on exhibition in Mersea Museum. The barrow itself is occasionally opened to visitors during Heritage Open Days in September.
More Roman work lies under the west end: a mosaic floor found beneath the churchyard and the hall at West Mersea, estimated at 21 ft 6 in by 18 ft, and about 200 yards east of it a Romano-British wheel tomb, its spoke walls radiating from a central chamber to a perimeter wall 65 feet round. Local historical accounts describe Roman Mersea as a retreat for veteran officers, and archaeological evidence points to more than one substantial Roman villa.
The beach runs along the south side of the island, facing out over the Blackwater Estuary, the largest estuary between the Thames and the Wash. It is a long sand-and-shingle beach with clean bathing water, and working anticlockwise the shore turns from mud to shingle to sand, which is where the pastel huts start.
Mersea has 400 beach huts. They have stood on West Mersea beach since the 1920s and line the shore along Victoria Esplanade, where the car park is, and numbers of them were swept out to sea in the 1953 flood. Some can be hired by the day, between 10:00 and 18:30, and cannot be slept in.
Time the beach as carefully as the causeway. At low tide the water retreats far out, exposing a gritty sandbank where you can hunt for shellfish and paddle in warm pools.
Mersea Island Vineyard was established in 1985. Its ten or so acres carry five grape varieties, among them Reichensteiner, Ortega and Muller Thurgau, and produce 20,000 bottles a year: dry whites, often a sweet dessert wine, and a sparkling wine made by the méthode champenoise. Tasting costs a small fee, there is a cafe on site, and tours can be arranged.
The vineyard shares its site with Mersea Island Brewery, whose beers have included Island Mud, Island Oyster, ChampAle and an Oyster Stout that has oysters among its ingredients. Local legend says the Romans grew grapes here and brought both the vines and the oysters; the sources record that as a story rather than as evidence.
The full circuit is a day out: about 13 to 14 miles on a flat coast path, taking five to six hours. It starts at West Mersea, passes the clapboard houses and the oyster sheds, then traces the north-coast marshes along the Strood and Pyefleet Channels. Because it uses public beaches as well as footpaths, it has to be planned around the high tides too.
For something shorter, one guide points walkers to a circuit around Cudmore Grove Country Park and its environs, and a 12.4 km walk starts from the free car park on East Road in East Mersea, postcode CO5 8UW. Crossing between the two ends of the island takes about an hour on foot, 17 minutes by bike or 8 by car.
Colchester is 9 miles north of the island on the B1025, about 20 minutes by car. It is the oldest recorded town in Britain, was Camulodunum under the Romans and Britain's first Roman capital, and was granted city status in 2022.
Colchester Castle is Europe's oldest Norman keep and was the largest keep ever built by the Normans, and it stands on the grounds of a Roman temple. Castle Park around it covers some 27 acres, bisected by a surviving stretch of the Roman wall, and hosts the Oyster Fayre in summer. The link between the two places is old: Mersea appears to have served as a retreat for inhabitants of Roman Camulodunum, and Roman buildings near the West Mersea quayside suggest a small settlement and port there, with a road running towards the town.
The season decides a lot. Colchester natives are harvested from September to May, rock oysters are available all year, and the Essex fishery is opened by the Mayor of Colchester each September. Mersea Week, a festival of boat racing run by West Mersea Yacht Club and Dabchicks Sailing Club since 1973, fills a week every August; its most celebrated event is the Round-the-Island race, where dinghies are helped over the Strood before carrying on by water.
Mersea has a relatively dry climate, and its saltmarshes form part of the Eastern Atlantic Flyway, a seabird migration route stretching from Siberia to South Africa. The town council's own guide tells visitors not to come for gambling arcades or white-knuckle rides: Mersea, it says, is more of a laid back sort of place.
West Mersea is the island's main inhabited area, and the shops, restaurants, pubs and small hotels are there. On Travelmyth's West Mersea listings you can rank stays by what you want from the trip rather than working down one long list, and the same applies to stays in Colchester if you would rather base yourself inland, or across Essex more widely.
Mersea has suffered less from the rise of holidays abroad than nearby resorts such as Clacton and Southend, and the reasons given are its isolated, rural atmosphere and the continued popularity of sailing. And the road still goes under for about a week in every month.