The Causeway and Antrim coast

A hard basalt and chalk coast facing north and east into the North Channel, with vertical columnar cliff, blocky boulder ground, deeply gullied wave-cut platform and deep water close in at the headlands. Long clean sand strands backed by dune lie in the bays between them. Tidal streams past the major points and through the sounds around Rathlin are among the strongest in Irish waters. Water is Atlantic-influenced — clearer and more oceanic than the Irish Sea proper — and cold year-round. Exposure to northerly and westerly weather is direct, and Atlantic ground swell reaches parts of this coast.

Rock and ledge shore fishing over deep water for pollack, wrasse, coalfish and conger, which is what the basalt ground gives and what this coast is best known for. Clean-ground beach fishing on the strands for bass, flatfish, ray and dogfish. Small-boat and charter fishing around the headlands, the sounds and the offshore reefs, entirely organised around the state of the tide. Lure fishing along the rock and in the tide races. Harbour and pier fishing, which is where much of the coast's casual fishing is done. Diving, which has a strong following around Rathlin because of the clarity and the wrecks. Creeling for crab and lobster along the rock coast.

Columnar basalt cliff and blocky boulder ground with extensive kelp; deeply gullied wave-cut platform; chalk exposures and sea caves; deep water immediately off the headlands; strong tidal races and overfalls at the points and in the sounds; long clean sand strands with dune systems in the bays; an offshore island with its own reef, sound and wreck ground; and small harbours and piers throughout.

Northern Ireland's fisheries framework is its own and is NOT the England and Wales framework. Sea angling requires no licence, but conservation measures, minimum sizes and species-specific rules apply and are administered by the Northern Ireland department responsible for fisheries. Freshwater and migratory fishing require both a rod licence and a separate permit, and the licensing body differs between parts of the country — the Foyle system in particular is administered by a cross-border body rather than by the Northern Ireland department, which catches visitors regularly. Substantial parts of this coast carry conservation designation for their geology, their habitats and their seabirds, and the Causeway itself is a World Heritage Site, all of which constrain access and activity independently of any fishing rule. Shellfish harvesting areas are classified for food safety. FishingHQ does not state what any current rule is.

The tide governs everything here and it does so at a scale visitors underestimate. Streams past the headlands and through the sounds run faster than a small craft can make ground against, produce overfalls and standing waves that form and disperse on the tidal clock rather than with the weather, and are made dramatically worse by wind against stream. A passage made comfortably on the slack is no information about the return. Ashore, the basalt gives excellent fishing platforms with deep water in front and vertical rock behind, and swell — including Atlantic ground swell that arrives independently of local wind — reaches them in sets. Being swept from a ledge rather than falling in is the mechanism, and the recovery problem is acute because the water is immediately deep and the rock behind offers nothing to climb. The gullied platform is a trip hazard filling with water. Cliff access to many marks is steep and in places unstable. Water is cold year-round so cold water shock decides an immersion in any month. The strands generate rip currents when a sea is running. And the coast is exposed to northerly and westerly weather with no shelter at all.

The geology here is famous above the waterline and it is at least as consequential below it, because basalt breaks in a way that other rock does not.

HOW BASALT WEATHERS. Cooling lava contracts and fractures, frequently into the polygonal columns this coast is celebrated for, and always into a mass of straight-edged joints. The sea exploits those joints rather than abrading the rock face, so a basalt coast erodes into blocks, steps, deep straight-sided gullies and sheer faces rather than into the rounded ledges and smooth platforms of sandstone.

UNDERWATER THAT PRODUCES A VERY SPECIFIC HABITAT. Vertical faces and overhangs. Deep narrow gullies that hold water and shelter through every state of tide. Enormous quantities of broken block on the seabed with gaps under and between it. And kelp forest over the top of all of it wherever there is light.

WHICH IS EXACTLY WHAT WRASSE, POLLACK AND CONGER WANT. Ballan wrasse are a structure animal that needs holes to retreat into and hard-shelled food to crush; a fractured basalt reef supplies both in quantity. Pollack hold on the kelp edges and in the water column over the gullies, ambushing along the vertical. Conger occupy the gaps beneath the blocks and stay there for years. This coast's rough-ground shore fishery is a direct consequence of the way the lava cooled.

IT ALSO EXPLAINS THE TACKLE. Ground this broken takes terminal tackle every session, so the rigs here are built to be lost cheaply — rotten-bottom links, expendable leads, and a working assumption that whatever goes into the gully is not coming out. Float and light lure fishing over the kelp is the alternative that avoids the ground rather than fighting it.

THE CHALK EXPOSURES ADD SOMETHING DIFFERENT. Where white chalk underlies the basalt it produces caves, arches and a paler, softer ground with its own community, and the contrast between the two rocks a few metres apart is unusually sharp.

AND THE STRANDS BETWEEN THE HEADLANDS ARE THE COUNTERWEIGHT. Clean sand, no structure, and a completely different fishery: bass in the surf, flatfish and ray over the open ground, dogfish at night. Tackle that is right for the basalt is wrong on the strand and the reverse. An angler on this coast is really choosing between two fisheries every time they choose a mark.

Most British and Irish shore anglers plan a session around wind and swell and treat the tide as a detail. On this coast the ordering is reversed, and getting that ordering right is most of what local knowledge consists of.

WHY THE TIDE DOMINATES HERE. The North Channel is the connection between the Irish Sea and the Atlantic, and a very large volume of water moves through it on every tide. Where that flow passes a headland it accelerates, and where it passes through a sound it accelerates further. The result is that the water in front of a mark on this coast is not a static thing with fish in it — it is a moving system whose speed and direction change through the day on a predictable schedule.

WHAT THAT DOES FOR THE FISHING. A hard stream past a point concentrates food and disorients it, so predators sit in the slack behind structure and take what comes past. That makes the productive window at any given mark a specific part of a specific tide, frequently short, and it moves through the month with springs and neaps. An angler fishing the right mark at the wrong state may as well be fishing a swimming pool.

SO THE PRACTICE IS TIDE-LED. Boat fishing here is planned around slack water at the specific ground rather than around a convenient departure time. Shore fishing on the rock is planned around when the stream runs past the mark and when the ledge is reachable and leavable. Lure fishing in the races is a matter of being there for perhaps ninety minutes.

THE DISCIPLINES THIS COAST SUPPORTS. Heavy ledgering over the broken basalt with expendable terminal tackle. Float fishing over kelp for wrasse and pollack, which suits the deep water close in unusually well. Lure fishing along the rock and in the tide races, which has grown a great deal. Clean-ground beach casting on the strands for bass, ray and flatfish. Small-boat and charter work around the headlands, the sounds and the offshore reefs. Pier and harbour fishing, which is where most casual fishing here happens. And diving around Rathlin, which the clarity and the wrecks support and which the streams constrain absolutely.

THE SEASON IS ATLANTIC-INFLUENCED rather than Irish Sea. Wrasse, pollack and mackerel from late spring through autumn on the rock. Bass on the strands and around the rock in the warmer months. Ray and flatfish over the clean ground. Conger through the year in the deep gullies. Winter is thinner than on the east coast and the weather closes far more of it.

This coast presents two severe hazards that are unrelated to each other, and the visitors who get into trouble are usually the ones who prepared for the wrong one.

THE FIRST IS THE TIDE AND IT IS A MATTER OF SPEED RATHER THAN SKILL. Streams past the headlands and through the sounds run faster than a kayak can paddle or a small outboard can push against. That is not a description of difficult conditions; it is an arithmetic statement about a craft's maximum speed. A boat that enters the acceleration is going where the water goes, and where the water goes is into overfalls and standing waves.

AND THE MISTAKE IS ALWAYS MADE ON THE APPROACH. From up-tide the water looks manageable, and by the time it does not the craft is already committed. Add wind against the stream — which stands the whole race up into short steep breaking water out of all proportion to the wind strength — and the margin disappears entirely.

WHICH GIVES A PLANNING ORDER THAT VISITORS FIND STRANGE. The tidal stream atlas is the primary document and the wind forecast is the secondary one. Know when the stream turns at the specific headland or sound rather than at a distant standard port. Do not attempt a sound on springs. Plan the return as carefully as the outward passage, because a passage made on the slack tells nobody anything about an hour and a half later. Treat visible overfalls as a boundary with a wide margin, since their position moves through the cycle.

THE SECOND HAZARD IS THE ROCK AND IT IS A MATTER OF SETS. The basalt gives superb fishing platforms with deep water immediately in front of them, which is why they are worth standing on. Swell arrives in sets, and on this coast some of it is Atlantic ground swell that comes independently of local wind and gives no warning in the sky. A ledge dry for twenty minutes is not evidence about the next wave.

THE RECOVERY PROBLEM IS WHAT MAKES IT LETHAL. Go in off a basalt ledge and the water is immediately deep, the face behind is vertical, kelp-covered and offers nothing to climb, and the gullies that make the fishing are surge channels. Watch a mark through several full set cycles from above the wet line before committing. Choose a platform with a way UP behind it rather than only a place to stand. Wear a buoyancy aid on the rocks. Do not fish exposed rock alone.

THE GULLIED PLATFORM ADDS A THIRD, QUIETER MECHANISM. Deep straight-sided gullies fill and empty with the surge, they are trip hazards, and moving across them in the dark or in the wet is how people are injured a long way from access.

AND COLD RUNS UNDER ALL OF IT. The water here is cold in every month, immersion produces the gasp response and loss of breathing control within seconds, and the strands produce rip currents when a sea is running. Carry the means of calling for help on your person, tell somebody the mark and the return time, and check both the tidal streams and the current inshore waters forecast before going.