Near the glens in the county of Antrim that were used for the Dothraki sea, lies Carncastle (aka Cairncastle). In the HBO series “Game of Thrones”, this castle was used as Winterfel. The mountains above the castle are used in season one, here Ned Stark executed Will.
A mythical place by itself are the “Glens of Antrim” in Northern Ireland. 9 glens strech over an area of 80 miles. Some can be seen in the popular HBO series “Game of Thrones”. In season three, they were used as Dothraki Sea. Other location in Ireland include: Murlough Bay,