Is john winthrops group of puritans chose to build their city upoon a hill to the south of Salem near the mouth of the Charles river a fact?

Yes, John Winthrop's group of Puritans did choose to establish their settlement on a hill to the south of Salem near the mouth of the Charles River. This decision was based on their belief that they were creating a "city upon a hill" as a model of virtue and religious purity for others to look up to.