A strait is a narrow channel of water that connects two larger bodies of water, and thus lies between two land masses. The terms strait, channel, passage, sound, and firth can be synonymous and interchangeable, although each is sometimes differentiated with varying senses. Many straits are economically important. Straits can lie on important shipping routes, and wars have been fought for control of these straits. Numerous artificial channels, called canals, have been constructed to connect two bodies of water over land.
   Although rivers and canals often form a bridge between two large lakes or a lake and a sea, and these seem to suit the formal definition of straits, they're not usually referred to as straits. Straits are typically much larger, wider structures that don't have water running in a single direction, and normally connect two seas.
   Straits are the duals of isthmi. That is, while straits lie between two land masses and connect two larger bodies of water, isthmi lie between two bodies of water and connect two larger land masses.

Well-known straits

• the palk strait, between India and Sri Lanka, the location of Ram Sethu and rich in natural resources
• the Strait of Dover, between England and France, which connects the North Sea with the English Channel
• the Strait of Gibraltar, the only natural passage between the Atlantic Ocean and the Mediterranean Sea
• the Bosporus and the Dardanelles, which connect the Mediterranean and the Black Sea
• the Strait of Magellan, connecting the Atlantic and Pacific Oceans north of Tierra del Fuego
• the Bering Strait between Alaska and Siberia, which connects the Pacific and Arctic Oceans
• the Strait of Hormuz connecting the Persian Gulf and the Gulf of Oman, through which Persian Gulf petroleum is shipped to the world
• the Strait of Malacca, which lie between Peninsular Malaysia and Sumatra, and connect the Indian Ocean with the South China Sea
• and the Bass Strait, which lies between mainland Australia and Tasmania, and connects the Indian Ocean with the Pacific Ocean.

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