Sentence:  As Broadway itself becomes increasingly weighted down by trite , heavy-handed , commercially successful musicals and inspirational problem dramas , the American theatre is going through an inexorable renaissance in that nebulous <WSD>area</WSD> known as `` off-Broadway '' . 
Meaning of the word marked with <WSD> tags:  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)