מִישׁוֹר mîyshôwr (H4334)

a level, i.e. a plain (often used (with the article prefix) as a proper name of certain districts); figuratively, concord; also straightness, i.e. (figuratively) justice (sometimes adverbially, justly)

1) level place, uprightness 1a) level country, table-land, plain 1b) level place 1c) uprightness

or מִישֹׁר; from יָשַׁר (H3474);