Hastings' Dictionary of the Bible (1898)
PLAIN, This word is often used alone, leaving the particular plain intended to be inferred from the connection; as, for instance, in Deut 1:1; Deut 2:8; or in Gen 13:12; 2 Kgs 25:4, etc., where the plain of Jordan is obviously intended. In other passages the name of the plain is added, such as Esdraelon, Sharon, etc., which see.