Where did the Celtic missionaries travel?

Celtic missionaries primarily traveled across Europe, particularly to regions such as present-day England, Scotland, Ireland, and parts of France. They played a crucial role in spreading Christianity, establishing monastic communities and churches in areas that were previously pagan. Notable figures like St. Patrick and St. Columba were instrumental in these missionary efforts, significantly influencing the religious landscape of the British Isles and beyond. Their journeys often involved traversing the seas, utilizing both land and maritime routes to reach their destinations.