Seas, Oceans and Straits

Water covers about 71 percent of the planet. And yet most of it remains a mystery, mapped in less detail than the surface of Mars. The oceans, seas, and narrow straits that carve up the globe have shaped trade, war, migration, and the rise and fall of empires for thousands of years.

Consider the scale of it. A single ocean holds more than half of all the water on Earth. The deepest ocean trenches plunge so far down that Mount Everest could sink into one and still leave over a mile of water above its peak. Pressure at the bottom is more than a thousand times what it is at the surface, enough to crush a submarine like a soda can.

Straits are where the drama really happens. These thin ribbons of water connect vast bodies of the sea, and whoever controls them controls the flow of goods and power. A huge share of the world's oil passes through a single narrow channel every day. Choke points like these have triggered blockades, sparked conflicts, and made fortunes for the cities lucky enough to sit beside them.

Then there are the oddities. One sea drifts freely with no land borders at all, defined instead by the swirling currents that pen it in. Another is so dense with salt that swimming there feels more like lounging on a mattress. Some seas take their names from vanished kingdoms; others honour explorers who never lived to see them mapped.

And what about the names themselves? Why does one stretch of water carry two entirely different names depending on which shore is doing the naming? Geography, it turns out, is rarely neutral.

From the frozen waters ringing Antarctica to the tropical shipping lanes threading between islands, the map of the world's water is packed with stories. Some of these places are household names. Others are known mainly to sailors, cartographers, and the occasional quiz enthusiast.

This quiz spans the globe, from famous oceans to obscure straits tucked between forgotten coastlines. It rewards curiosity and punishes guesswork. Sharpen up on the currents, channels, and salty expanses that connect every corner of the planet, then dive in and see how far that knowledge floats.