Bath, or as it is known Aquae Sulis, is located on the sacred spring. This is because when the Romans arrived in Britain, Celts were worshipping the spring. To show the Celts that they were kind, the Romans built the city of Bath around the spring and dedicated it to the Celtic Goddess, Sulis. This is where the name Aquae Sulis comes from (Waters of Sulis).
To get here, sail to Britannia. Once you arrive on the main island, (make sure it's not the Isle of Wight) travel north-west by chariot and you will arrive in a few days. You will know you are close when you see a landscape similar to the one in the image on the left.