Quiz: Lands kept aside, or collectively, by a sliver

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Clockwise from high left, these are the cities of Auckland, Manila, Seattle, and Madison. What have they got in widespread according to this quiz’s theme?

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Name the slim waterway that separates Europe from Asia and which has been central to commerce and warfare for hundreds of years. Once referred to as the Hellespont, it connects the Sea of Marmara with the Aegean. Xerxes’s military famously crossed it on a pontoon bridge in 480 BC, adopted by Alexander the Great in 334 BC.

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This 77-kilometre-long construction connects the Atlantic and Pacific Oceans through a slim Central American land bridge, saving ships practically 13,000 km of journey. Its building reshaped international transport routes and required a main effort to overcome each tropical illness and terrain. Name it.

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This strait is just 3.8 km large at its narrowest level. It separates a British abroad territory from the Spanish mainland, connects the Atlantic Ocean to the Mediterranean Sea, and is dwelling to a well-known rock with mythic associations. Name the strait.

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This slim strait hyperlinks the Crimean Peninsula to the Russian mainland and has been of strategic navy curiosity since historical instances. It can be the location of a fashionable bridge that’s typically been within the information vis-à-vis Russia’s warfare in opposition to Ukraine. Name the straight.

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Often mistaken for a human-made construction, this pure characteristic is a slender land connection between two massive landmasses, separating the Pacific Ocean from the Arctic ocean. During the Ice Age, it helped people cross from the higher edges of Asia into North America. Name it.