Corinth Canal: Navigation and History

^{EcoChap, CC BY-SA 3.0, via Wikimedia Commons}

Long before anyone managed to slice through the Isthmus of Corinth, people understood why it needed to happen. The narrow strip of land connecting mainland Greece to the Peloponnese peninsula was forcing ships into a 400-kilometre detour around the southern coast. That detour added days to the average voyage and exposed boats to some of the most unpredictable waters in the Mediterranean.

For more than two thousand years, engineers looked at that massive stretch of earth and rock and wondered if and how they could put a canal there. And it took until the late 19th century for someone to finally do it.

But once they did, everything changed. And it’s an area worth exploring.

The Idea Before the Canal

The desire to connect the Gulf of Corinth to the Saronic Gulf is centuries old. The tyrant Periander of Corinth, who ruled in the 7th century BC, is largely credited as the first person to seriously consider cutting a canal through the isthmus. He eventually abandoned the idea, as the scale of the excavation was simply too much to accomplish given the technology they had at the time.

What Periander built instead was the Diolkos. This was a paved trackway that allowed ships to be hauled overland across the narrowest point of the isthmus on wheeled platforms. The Diolkos worked. For roughly 600 years, vessels were dragged across the land bridge rather than sailing around the peninsula. Portions of the original stone trackway are still visible near the canal's western entrance.

^{Dan Diffendale, CC BY-SA 2.0, via Wikimedia Commons}

The most serious “ancient” attempt came from Emperor Nero in 67 CE. Nero started digging without much of a plan. He brought 6,000 prisoners of war to the site and reportedly broke ground himself using a golden shovel. The project advanced enough to leave a visible trench, parts of which later engineers would use as their starting point. But Nero's death the next year ended the effort, and nothing was done for years.

The Canal Gets Built

The project that finally succeeded began in 1881, shortly after Greece gained full independence and began investing in more modern infrastructure. A French engineering company initially won the contract, and construction began the following year.

The canal finally opened on July 25, 1893, after eleven years of construction. The result was a straight, narrow cut through limestone and sandstone walls. They reach as high as 79 metres (259 feet) above the waterline. In total, the canal stretches 6,300 metres (nearly four miles) in length, with a width of only 21.4 metres (70 feet) at the water's surface.

The construction was an enormous achievement for its time (and still considered quite impressive today). Workers removed massive amounts of earth using a combination of dynamite and labour. And while the result was impressive, there were some major sacrifices involved in making it happen, including plenty of lives lost.

Why the Canal Never Became What People Expected

For all the centuries of anticipation, the Corinth Canal never transformed into the major commercial shipping route people thought it would become. The problem is and always has been the dimensions. The canal is too narrow and too shallow for modern commercial vessels. Large cargo ships and tankers can’t fit through it. Combine that with the fairly shallow depth, and only smaller boats and yachts can make it through safely.

Today, the canal handles a modest volume of traffic, primarily smaller commercial vessels, tugboats, and leisure boats. Roughly 12,000 vessels pass through in a typical year, a fraction of what passes through major commercial canals elsewhere in the world. However, the canal saves those vessels the long trip around the Peloponnese, cutting the journey by roughly 700 kilometres (434 miles) depending on the route. For smaller ships, the savings in time and fuel still make the trip worthwhile.

What It Feels Like to Pass Through

For all its limitations as a commercial waterway, the Corinth Canal is a memorable experience for anyone who goes through it. The passage takes about 30 minutes at the regulated speed, and the visual effect is unlike anything most people have seen before. Because of how high the rock face is on either side, it almost feels like you’re inside a rock or a cave.

The light inside the canal shifts depending on the time of day and the season. Early morning trips catch the sun at low angles, basically turning the limestone walls into a gold and amber hue. But later on, the afternoon light brings out the layers of sediment.

^{Winston Cooke, CC BY-SA 4.0, via Wikimedia Commons}

For charter guests and yacht owners, the canal passage is usually one of the most talked-about moments of their entire trip. However, behind the scenes, it takes a lot of work to make it happen.

Going through the Corinth Canal requires coordination with the canal authority. Vessels need to arrange passage in advance, and traffic moves in one direction at a time due to the narrow width. Speed has to be controlled to minimise wake and protect the walls from erosion.

For sailing yachts, the transit is done under engine power. There's no room to sail inside the canal, and wind behaves unpredictably in the narrow corridor. Masts clear the bridges overhead with plenty of room, but the visual of looking up from a sailboat cockpit at the bridge structure and the rock walls above it is part of what makes the passage so intriguing.

Before and after the transit, the submersible bridges at each end of the canal are worth watching. These bridges carry road traffic across the canal entrances and lower beneath the water's surface when vessels need to pass through.

^{Aspasia Coumiotis, CC BY-SA 1.0, via Wikimedia Commons}

The Saronic Gulf

The Corinth Canal basically sits at a crossroads between two of the best cruising grounds in Greece. This is a big part of why it sees consistent yacht traffic throughout the sailing season. Going through the canal connects you to two totally different boating experiences on either side.

The Saronic Gulf, on the eastern side, is one of the most popular and accessible sailing regions in the Mediterranean. The fact that it’s so close to Athens makes it a natural starting point for charters. You're rarely more than a few hours from the next anchorage or harbour, which makes the Saronic ideal if you don’t want to do long days at sea.

• Aegina is the closest major island to Athens and a popular first stop for boats heading south from the capital. The island has a working fishing port, a nice waterfront area, and the Temple of Aphaia. This is one of the best-preserved ancient temples in Greece.
• Poros sits further south, separated from the Peloponnese mainland by a narrow channel. The town of Poros is up on a hillside above its harbour. The anchorage is well-protected, which makes it a comfortable overnight stop when conditions might be rough in other waters.
• Hydra is the island that tends to leave the strongest impression on first-time visitors. No cars are allowed on the island, which is pretty unique. Donkeys carry goods up the steep lanes, and the town is built into a natural amphitheatre above the waterfront. The harbour is small and fills up during peak season, so arriving earlier in the day or anchoring outside the harbour is a good move.
• Spetses, the southernmost of the main Saronic islands, has a totally different character. It's slightly more spread out, with pine forests and quieter beaches that are accessible by boat. The old harbour is picturesque, and the island's naval history is visible in the architecture and the museums.

Between the islands, the Saronic Gulf offers a number of smaller anchorages and secluded bays along the Peloponnese coastline. The bay of Epidavros, for example, is a popular stop. It has a beautiful theatre where performances are still held during the summer months.

The Gulf of Corinth and Beyond

The western side of the canal opens into the Gulf of Corinth, This is a long, protected body of water that stretches northwest between the mainland and the Peloponnese. It eventually narrows toward the Rio-Antirrio bridge and the Ionian Sea. The gulf is quieter than the Saronic, with fewer charter boats and crowds.

• Galaxidi is often the first stop for boats heading west through the canal. This small town on the northern shore of the gulf was once a pretty significant shipbuilding centre. Its maritime heritage is visible both in the architecture and the small nautical museum they have there. The harbour is well-protected and the town itself has a handful of good places to eat or enjoy a drink along the waterfront.
• Nafpaktos has a neat Venetian harbour and hilltop castle that give you wide views over the gulf. The harbour is small and definitely has a vibe, as it’s enclosed by stone walls and flanked by a fortress. If you’re into history, you’ll appreciate the fact that Nafpaktos is where the Battle of Lepanto took place in 1571. This was one of the largest naval battles in Mediterranean history.
• Itea, near the ancient site of Delphi, gives you access to significant archaeological sites in Greece from the water. Anchoring or docking in Itea and making the short trip up the mountainside to Delphi will give you some really neat sights.

As you continue west and pass under the Rio-Antirrio bridge, you leave the gulf behind and enter the Ionian Sea. The coastal part of this area is known for calm summer conditions and beautiful water. Many charterers who transit the Corinth Canal are eventually heading for these islands.

Planning a Canal Transit as Part of a Charter

If you're building a charter itinerary that includes a canal transit, a few things are worth knowing.

• The canal's operating status is the first thing to check. Landslides and maintenance closures have been known to interrupt service at various points. Confirming that the canal is open before finalising your route saves you from a last-minute reroute. Your charter company or skipper will handle the transit logistics, but just be aware of this.
• Most itineraries that include the canal are one-way charters, starting in a Saronic Gulf marina and ending in an Ionian port, or the reverse. One-way charters offer the advantage of covering more ground and experiencing two distinct cruising regions in a single trip. The canal passage itself becomes a natural midpoint.
• The sailing season in this part of Greece runs roughly from April through October, with peak conditions from June through September. Early and late season transits offer cooler weather and a more relaxed pace. Peak season brings warmer water and bigger crowds.
• Transit fees are based on vessel size and type, but for most charter yachts, the cost is pretty minimal. Your skipper or charter company will arrange payment and scheduling in advance. Passages are assigned specific time slots since traffic moves in one direction at a time. Building some flexibility into your itinerary around the transit day helps avoid scheduling stress if there happen to be any delays.
• Provisioning before the transit is worth thinking about. The marinas near the canal on both sides have basic services, but they're not major provisioning stops. Stock up in Athens or a larger Saronic port before heading west. Or do so in a well-equipped Ionian marina before heading east. This means you won't need to scramble for supplies in smaller towns near the canal.
• Have your camera ready but also plan to put it down for part of the passage. First-time transit passengers tend to spend the entire 30 minutes filming from the deck, which is understandable. But the scale of the walls hit differently when you're not looking through a screen. Take the video you want in the first few minutes, then give yourself the rest of the passage to take it in.

Find the Perfect Yacht or Charter Boat

Whether you’re looking to sail through the Corinth Canal, charter a boat on the Mediterranean, or quietly cruise through some lesser-known waterways, TheYachtMarket is the perfect place to buy a boat or charter one. There’s never been a better time to get out on the water.