The province of Ireland is ULSTER, which is a six-letter word. ULSTER is one of the four provinces of Ireland, along with Connacht, Leinster, and Munster. It is located in the northern part of the island and is the largest of the four provinces. ULSTER is home to many of Ireland's most famous landmarks, including the Giant's Causeway and the Mourne Mountains. It is also home to the cities of Belfast and Derry.