Monmouthshire

American  

[mon-muhth-sheer, -sher] / ˈmɒn məθˌʃɪər, -ʃər /

noun

1. a county in eastern Wales. 330 sq. mi. (850 sq. km).

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Monmouthshire British  

/ ˈmɒnməθˌʃɪə, -ʃə /

noun

1. a county of E Wales: administratively part of England for three centuries (until 1830); mainly absorbed into the county of Gwent in 1974; reinstated with reduced boundaries in 1996: chiefly agricultural, with the Black Mountains in the N. Administrative centre: Cwmbran. Pop: 86 200 (2003 est). Area: 851 sq km (329 sq miles)

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Etymology

Origin of Monmouthshire

Monmouth ( def. ) + shire ( def. )

Example Sentences

Now, as part of a UK-first Forestry Commission-backed trial, the team plans to grow thousands of native British trees for a new woodland in Monmouthshire, South Wales.

From BBC • Apr. 2, 2026

Demi Edmunds, from Caldicot, Monmouthshire, died at the scene after emergency services were called to the A4042 in Cwmbran, Torfaen, on 12 February.

From BBC • Mar. 2, 2026

Alfie Kiely from Caldicot, Monmouthshire, spent three months in Malaysia while shooting Lord of the Flies, playing one of the "Littluns".

From BBC • Feb. 6, 2026

He said Malaysia was "really fun" and he enjoyed visiting waterfalls and waterparks, while also doing school work sent from Monmouthshire.

From BBC • Feb. 6, 2026

Unlike Darwin—gentleman biologist, and soon to be England’s most lauded natural historian—Wallace had been born to a middle-class family in Monmouthshire.

From "The Gene" by Siddhartha Mukherjee