Newmarsh (Irish: Corcach Nua) is a principality in northwest Maltropia. It is officially named the Principality of Newmarsh (Irish: Prionsacht Chorcaí Nua) to distinguish it from its capital and largest city, Corcaigh Nua (historically also called Newmarsh), which is also the national capital. Newmarsh is the second most populous Maltropian principality, home to _,___,___. It is Maltropia's fourth smallest principality by area, at 64,316.68 square kilometres.

It is bounded to the south by Carbery and to the east by Cluan Áed, with the Johan Sea lying to the north.

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