Greencastle (Irish: An Caisleán Nua), is a commercial fishing port located in the north of the scenic Inishowen Peninsula on the north coast of County Donegal, Ireland. Nowadays, given the decline in the fishing industry, it resembles more closely a 'typical' Donegal holiday village. It is located a few miles from Moville and is about 20 miles from Derry. Greencastle's name comes from the castle in the area, which, in turn, may have derived its name from the green freestone with which it was built. The castle, originally built by the Anglo-Normans, is also known as Newburgh Castle.