Plymouth is a city in Devon, and the largest city on England’s south coast, where the River Plym and the River Tamar flow into the large bay of Plymouth Sound, creating a perfect natural harbour. The sea has been at the heart of Plymouth since it was founded in the middle-ages as a trading post and the source of its prosperity. Plymouth was the point from which the Pilgrim Fathers left England in 1620 for Massachusetts, commemorated today in the Mayflower Steps.