More than 40% of visits to Ireland last year came from Britain, and that proportion would almost certainly be even higher if trips made by residents of Northern Ireland were also included.
RTÉ business journalist Adam Maguire visited Co Donegal, a county that is more dependent than most on the tourist trade, to assess what Brexit may mean for the region.
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Follow Adam's journey around the country via his blog for RTÉ Drivetime.
