North Eastern Atlantic

The northeastern Atlantic waters off Ulster connect Ireland's northern coast with Scotland, the Irish Sea approaches, and wider ocean routes. Islands, headlands, tidal passages, and exposed stretches create varied conditions for navigation. Fishing and coastal transport supported communities along the shore, while ships carried goods and people between neighbouring ports. Local knowledge of currents, weather, and safe anchorages was essential even on journeys that appeared short by distance.

In the later Middle Ages, maritime routes supported close political and cultural ties between northern Ulster, western Scotland and the southern Hebrides. Irish chiefs employed soldiers known as gallowglass from the Scottish Highlands and islands, some of whom settled in Ireland. In the seventeenth century, plantation and warfare changed landholding and population in Ulster, while crossings continued to carry people and supplies between the coasts.