Land in the river ---

Rory O'Conor wrote:
Can someone explain these VFR corridors around Manhattan?
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In the UK, when flying VFR we should always fly so that we can always
land clear of densely populated areas.
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I cannot see how a VFR corridor up a river surrounded by skyscrapers is
compatible with that concept.
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Does the FAA guidance require pilots to be able to land clear of
built-up areas?
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Rory