This morning they made trips to local companies before heading to a civic reception in Letterkenny
The Prince of Wales and the Dutchess of Cornwall are visiting Ireland this afternoon.
They visited Donegal Town this morning and made trips to some local companies, before heading for a civic reception in Letterkenny which starts shortly.
Speaking at Donegal Castle, Britain's Prince Charles said it was a "pleasure" to be in the Republic again.
Local butchers Ernan and Duirmuid McGettigan received a visit from the royals who described their produce as "delicious" and "fabulous."
Prince Charles and Camilla also paid a visit to Magee's, a local company which has been producing tweed for 150 years.
The Royals programme now has them at a Civic Reception in Letterkenny with Foreign Affairs Minister Charlie Flanagan.
Afterwards, Camilla will travel to a local national school while Prince Charles gets a tour of Letterkenny IT.
Their short visit to Ireland will conclude with a trip to Glenveagh National Park where they'll be seen off by Minister Heather Humphreys.
CEO of Tourism Ireland said these royal visits are worth a lot to the country:
"When the queen came five years ago we worked a lot with the international media, which if we were to buy that publicity it would have cost us €298million".
The Minister for Foreign Affairs says today's visit by Prince Charles and Camilia to Donegal shows the clear 21st century friendship between Ireland and Britain.
Charlie Flanagan also said it revealed an ever-increasing co-operation across the island - and specifically cross-border partnerships between counties like Donegal and Derry.