Monmouth

geographical name

Mon·​mouth ˈmän-məth 

ˈmən-

variants or Monmouthshire

ˈmän-məth-ˌshir 

ˈmən-, 

-shər

administrative area of southeastern Wales bordering on the estuary of the Severn River and on England, which it was sometimes considered to be part of area 328 square miles (850 square kilometers), population 91,323