Mighty; strength. (1.) One of the chief towns of the kingdom of "Bashan (Josh. 12:4, 5). Here Og was defeated by the Israelites," and the strength of the Amorites broken (Num. 21:33-35). It "subsequently belonged to Manasseh, for a short time apparently," and afterwards became the abode of banditti and outlaws (Josh. "13:31). It has been identified with the modern Edr'a, which" stands on a rocky promontory on the south-west edge of the Lejah "(the Argob of the Hebrews, and Trachonitis of the Greeks). The" ruins of Edr'a are the most extensive in the Hauran. They are 3 miles in circumference. A number of the ancient houses still "remain; the walls, roofs, and doors being all of stone. The wild" region of which Edrei was the capital is thus described in its "modern aspect: "Elevated about 20 feet above the plain, it is a" "labyrinth of clefts and crevasses in the rock, formed by" "volcanic action; and owing to its impenetrable condition, it has" "become a refuge for outlaws and turbulent characters, who make" "it a sort of Cave of Adullam...It is, in fact, an impregnable" "natural fortress, about 20 miles in length and 15 in breadth" "(Porter's Syria, etc.). Beneath this wonderful city there is" "also a subterranean city, hollowed out probably as a refuge for" the population of the upper city in times of danger. (See [171]BASHAN.) "(2.) A town of Naphtali (Josh. 19:37).

See where Edrei occurs in the Bible...

Definition of Edrei:
"a very great mass, or cloud"