Easton's Bible Dictionary (1897)
Hollow Syria, the name (not found in Scripture) given by the Greeks to the extensive valley, about 100 miles long, between the Lebanon and the Anti-Lebanon range of mountains.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
COE'LE-SYR'IA (hollow Styria), the great valley between the Lebanon and Anti-Lebanon ranges of mountains. See Lebanon and Syria.