These related words, each meaning "surroundings," "surrounding area," are pronounced respectively "en-VAI-ruhn-muhnt" and either "en-VAI-ruhnz" or "EN-vuh-ruhnz." Although not a true plural and without a singular form, environs should not be used with any word involving number: one cannot say "three environs of the city" or "many environs in this state."
Dictionary of problem words and expressions. Harry Shaw. 1975.