The term 'Shamrock Country' is a reference to the Republic of Ireland, which is also known as EIRE (4 letters) and ERIN (4 letters). The shamrock is a symbol of Ireland and is often used to represent the country. It is believed that Saint Patrick, the patron saint of Ireland, used the shamrock to explain the concept of the Holy Trinity to the Irish people. The Republic of Ireland is an independent nation located in the north-western part of Europe. It is bordered by the United Kingdom and the Atlantic Ocean.