The number of overseas visitors to Ireland from Great Britain continued to fall during the first three months of the year, according to new figures from the Central Statistics Office.
796,000 British visits were recorded between January and March, compared with 851,000 for the same period in 2016.
Since the United Kingdom voted to leave the European Union last June, the number of UK visits to Ireland has steadily fallen.
Sterling has lost around 15% in value against the euro since the Brexit vote, making Ireland considerably more expensive for British visitors.
Last June - before the vote - one euro was valued at £0.7649, before rising to nearly £0.86 within two weeks.
In Q3 2016 1,148,000 residents of Great Britain travelled to Ireland, while for the last three months of 2016 that figure had fallen to 911,000.
However, the drop in UK visits has been largely offset by a significant rise in the number of visits to Ireland from other markets such as Australia and North America.
293,000 residents of the US and Canada visited the country between January and March, which was 55,000 higher than the same period a year ago.
The CSO figures show that overall the number of overseas visits to Ireland during the first quarter rose by 0.6% to 1,785,000 when compared with the same period in 2016.
However, both the average length of stay (down from 6.5 nights to 6.2 nights) and average spend in the country (1.3% lower at €684m) from visitors have dropped quarter-on-quarter.
Commenting on the figures, Tourism Ireland said the latest CSO figures reflect the challenge of Brexit.
Tourism Ireland CEO Niall Gibbons said: "As anticipated, the challenge of Brexit for Irish tourism is very real and we're beginning to see the impact of currency changes in today's CSO results - which confirm a decline of -1% in revenue from overseas visitors to Ireland in the first three months of 2017, including a decline of almost -8% in revenue from British visitors.
"It's more competitive than ever before in the international marketplace. The movement of sterling versus the euro and dollar, since the UK referendum on Brexit, makes Great Britain a more competitive destination for visitors from Mainland Europe and the United States.
"We have observed our competitors - VisitBritain, VisitScotland and VisitWales - intensifying their operations across all of Ireland's major tourism markets to capitalise on this.
"Therefore, competitiveness and our value for money message are more important than ever right now."
Meanwhile, the number of trips made by Irish residents overseas increased by 6.2% to 1,569,000 in Q1.
