The nickname of Ireland is "The Emerald Isle." The nickname comes from the large amounts of green grasses and rolling hills that can be seen all over the country.
The green fields that are synonymous with Ireland are due to the moist air and temperate climate. Ireland has large amounts of green shamrock covering the countryside. The shamrock is the symbol of Ireland and legend says that St. Patrick, who is the patron saint of Ireland, used the shamrock to explain the Holy Trinity to the Celts. Ireland comprises of the Republic of Ireland and Northern Ireland.