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Q1:What do you think will happen to this narrow neck of land in the future?

[Answer]

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Oxbows

An oxbow is a name for a type of meander where the river has almost bent back on itself, leaving just a narrow neck of land between upstream and downstream arms of the meander.

(The name oxbow comes from the bowed (curved) shape of wood used as a harness for oxen in the past)