Lord of the Rings' was inspired by the Burren
Tolkien visited the West of Ireland on many occasions and spent considerable time in the Burren when he held the position of External Examiner to the English Department of NUI Galway between 1949 and 1959.
During this time he revised and published The Lord of the Rings. “An unexpected body of evidence is beginning to emerge that unmasks Ireland and The Burren in particular as a significant influence on Tolkien’s creative imagination,” explained University of Ulster Lecturer and Tolkien scholar Dr. Liam Campbell.
source: https://www.thejournal.ie/lord-of-the-rings-the-burren-1617998-Aug2014/