<P> A Bering Strait crossing is a hypothetical bridge and / or tunnel spanning the relatively narrow and shallow Bering Strait between the Chukotka Peninsula in Russia and the Seward Peninsula in the U.S. state of Alaska . The bridge or tunnel would provide a connection linking North America (and potentially South America, see: Darién Gap) with Asia, Africa and Europe . </P> <P> With the two Diomede Islands between the peninsulas, the Bering Strait could be spanned by a bridge and a tunnel . There might be one long bridge, almost 40 km (25 mi) long, connecting Alaska and the Diomede Islands, and a tunnel connecting the Diomede Islands and Russia . The earth bored from the tunnel could be used as landfill to connect the two islands . However, the construction of a Bering Strait crossing would face exceptional political, engineering, and financial hurdles . </P>

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