<P> Many straits are economically important . Straits can be important shipping routes, and wars have been fought for control of them . </P> <P> Numerous artificial channels, called canals, have been constructed to connect two bodies of water over land, such as the Suez Canal . Although rivers and canals often provide passage between two large lakes or a lake and a sea, and these seem to suit the formal definition of strait, they are not usually referred to as such . The term strait is typically reserved for much larger, wider features of the marine environment . There are exceptions, with straits being called canals, Pearse Canal, for example . </P> <P> Straits are the converse of isthmuses . That is, while a strait lies between two land masses and connects two larger bodies of water, an isthmus lies between two bodies of water and connects two larger land masses . </P> <P> Some straits have the potential to generate significant tidal power using tidal stream turbines . Tides are more predictable than wave power or wind power . The Pentland Firth (a strait) may be capable of generating 10 GW . Cook Strait in New Zealand may be capable of generating 5.6 GW even though the total energy available in the flow is 15 GW </P>

What is the difference between isthmus and strait
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