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During the gold rush, the Yukon Rivers largest settlement was Dawson.

Which revision is correct?

During the gold rush, the Yukon River’s largest settlement was Dawson.
During the gold rush, the Yukon Rivers’ largest settlement was Dawson.
During the gold rush, the Yukon’ Rivers largest settlement was Dawson.
During the gold rush’, the Yukon Rivers largest settlement was Dawson.