Submarine Cable Map: the website that maps the internet's wiring

Submarine Cable Map, at submarinecablemap.com, is a free, zoomable atlas that plots nearly every major undersea cable carrying the world's internet traffic, along with the points where each one comes ashore. It does one thing, and it does it with real authority: the data is TeleGeography's, and the result is what the physical internet actually looks like once someone bothers to draw it.

In brief

• Submarine Cable Map, at submarinecablemap.com, shows every major submarine cable in service or planned, drawn as coloured lines across the oceans with a dot at each landing point.
• The data is TeleGeography's, drawn from the research it sells to the telecoms industry, so the map is a genuine reference rather than an art piece that happens to look like one.
• There is nothing to buy, sign into or configure. A visitor pans, zooms, and clicks a cable to read its name, length, owners and landing points.
• It quietly makes a point most people never consider: the internet is not a cloud but roughly 1.5 million kilometres of glass resting on the seabed.

What the Submarine Cable Map actually is

Submarine Cable Map is a single-purpose website in the truest sense. It opens to a slate map of the world, the oceans crossed by thin coloured lines and the coasts freckled with small dots. Each line is a submarine cable. Each dot is a landing station, the spot on land where a cable leaves the sea and joins the terrestrial network. There is no tour, no account and no menu of features to master. You pan, you zoom, you click.

Selecting a cable is where the map earns its keep. A panel slides in with the cable's name, its length, its ready-for-service date, the owners behind it and the full list of landing points it connects. Selecting a landing point does the reverse, naming every cable that terminates there. The whole interface is that one loop, repeated at whatever scale the visitor chooses, from a single harbour to the width of the Pacific.

The map did not start on the web. TeleGeography has produced printed submarine cable maps for years, wall posters often styled after old nautical charts, and the interactive version grew out of that habit. What was once a static poster is now a living map, and that shift from paper to something that updates is a large part of why the site repays a return visit.

The invisible infrastructure it makes visible

The map's quiet argument is that the internet is a physical thing. According to TeleGeography's submarine cable FAQ, there are more than 600 active and planned submarine cables in the world, and by early 2026 over 1.5 million kilometres of cable were in service. Those figures are easy to read and hard to picture. The map turns them into something the eye can hold: a dense mesh of lines that thins to a few brave threads across the widest stretches of ocean. That contrast is much of the point. A view of only the busy North Atlantic would flatter the internet, while this one also shows how thinly it reaches the places in between.

People like to say their data lives in the cloud. Almost none of it travels by satellite. TeleGeography has examined the much-repeated claim that submarine cables carry more than 99 percent of intercontinental data traffic, and in a mythbusting post it confirmed the figure is broadly true, while cautioning that it cannot be calculated precisely, because reliable public data on intercontinental satellite traffic no longer exists. Either way, the lines on this map are how the world talks to itself.

How the map gets drawn

Part of what makes the site trustworthy is that its makers are open about how it is built. This is not a scrape of someone else's data dressed up as a graphic.

From research to GeoJSON

TeleGeography's FAQ lays out the pipeline. Cable routes and landing points begin as drawings in Adobe Illustrator, then Avenza's MAPublisher plug-in exports them as GeoJSON, the routes as lines and the landings as points. That geographic data feeds the interactive map, which is built on the RedwoodJS framework and the Google Maps JavaScript interface. TeleGeography has also released design components from the project openly, so the map's distinctive look can be reused by others.

Why it never sits still

The network is never finished. New cables light up, old ones are retired, and routes shift with politics and money. TeleGeography says it updates the map often, so that recent deployments, new landing points, changes in topology and cable retirements are reflected. A line that crossed a particular sea last year may be redrawn or gone this year. That is why the map reads less like a fixed diagram and more like a slow news feed for infrastructure.

What the cables really are

Zoom in far enough and it is worth remembering what those tidy lines actually represent out in the water.

Thinner than they sound

A submarine cable sounds like a monstrous industrial object. Most of its length is not. The FAQ notes that across the open ocean a cable is only about as wide as a garden hose, and the glass fibres inside, the part that actually carries the light, are each roughly the diameter of a human hair. The armour thickens near shore, where anchors and trawlers are the danger, but the deep-sea sections are startlingly slight for something that carries a continent's conversations.

Fragile, and constantly mended

Because they are thin and very long, cables break. TeleGeography, citing the International Cable Protection Committee, puts the count at roughly 200 faults a year, and says accidents such as fishing gear and dragged anchors cause about two-thirds of them. Repairs fall to a small global fleet of cable ships, which haul the broken ends up from the seabed, splice them and lower them back down. A cable is designed to last at least 25 years, though shifting economics can retire one earlier.

Who owns the lines

The map also hints at a change in who builds all of this. For decades, submarine cables were funded by consortiums of telephone and telecoms carriers that shared both the cost and the capacity. TeleGeography's FAQ notes that this has shifted: content providers such as Google, Meta, Microsoft and Amazon are now among the largest investors in new cable, laying private lines to link their own data centres. Click through enough cables on the map and those names begin to appear in the owner field, a small tell about how weight on the internet has moved.

Why people lose an afternoon in it

None of that explains why the map is so pleasant to sit with, but it is. The appeal is close to that of a good atlas. There is no goal, no score and no ending, only the standing invitation to follow a line and see where it goes. A single cable might leave one continent, run for thousands of kilometres along a coast, and surface again on the far side of an ocean, and tracing that whole journey is quietly absorbing.

Part of the pull is sheer scale. The map lets a visitor swing from the entire planet down to one small harbour and back, and each level tells a different story. Zoomed out, certain narrow straits reveal themselves as chokepoints where many cables funnel through together. Zoomed in, a remote island can be seen hanging from a single fragile thread, its entire link to the rest of the world resting on one line. It rewards the kind of slow, aimless attention that most of the web is engineered to prevent, which is exactly why it belongs among quiet, single-purpose sites.

Where it sits in the quiet web

Submarine Cable Map sits with a small family of sites that take real data and simply let a person wander through it. It shares the pleasure of 100,000 Stars, a map of the nearest stars you can fly through, and it pairs naturally with The Deep Sea, which scrolls down through the very ocean these cables lie across. Anyone who enjoys spinning a globe to explore the world will recognise the same impulse in Radio Garden.

For a longer wander through pages built on this spirit, there is a roundup of useless websites to visit when bored. The same taste for slowing down runs through the wider Boring Websites network, including The Bureau of Very Slow News, which reports the world at a deliberately unhurried pace. Like the cable map, it asks for patience rather than clicks, and gives back something calmer than the usual feed.

FAQ

What is the Submarine Cable Map and what can you do on it?

Submarine Cable Map, at submarinecablemap.com, is a free interactive map of the world's major submarine communications cables. Every cable in service or planned is drawn as a line, and every landing point where a cable meets land is marked with a dot. You can pan and zoom anywhere on Earth, click a cable to see its name, length, owners and landing points, or click a landing point to see every cable that lands there. There is no account to make, no cost and nothing to install.

Who makes the map, and is the data reliable?

The map is made by TeleGeography, a telecommunications market research firm, and it draws on the same submarine cable research the company sells to the industry. Its FAQ explains how routes and landing points are drawn in Adobe Illustrator, exported as GeoJSON and updated often to reflect new cables, new landings and retirements. It is a professional reference that happens to be free to browse, though TeleGeography is clear that the map is a simplified view rather than a precise navigational chart.

Do submarine cables really carry almost all international data?

More or less, yes. TeleGeography addressed the widely repeated figure that submarine cables carry over 99 percent of intercontinental data traffic and, in a mythbusting post, confirmed it is broadly accurate. The company added a caveat worth keeping in mind: it cannot calculate the exact share, because there is no longer reliable public data on how much traffic still moves by satellite. Satellites handle a sliver, mostly serving places cables do not reach, but the overwhelming majority of the world's international data runs through the lines on this map.

What happens when a submarine cable breaks?

Breaks are routine rather than catastrophic. TeleGeography, citing the International Cable Protection Committee, estimates roughly 200 faults a year, most caused by fishing gear and ships' anchors. Because traffic is rerouted across other cables almost instantly, users rarely notice a single fault. Repairs are handled by a specialised fleet of cable ships that locate the break, lift the cable to the surface, splice in a fresh section and lower it back to the seabed. It is slow, costly work, and it is under way somewhere in the world almost all the time.

More boring websites like this: Interactive map & globe websites.