Catskill Mountains

About 70 miles long and about 50 miles wide. Why can't you look up a simple thing like that in any encyclopedia yourself?

Because it was easier for him/her/it to register here and in what is so far...3+days and counting...their only post, to ask somebody else to do the task. Maybe they don't understand the intricacies of encyclopedias or other research manuals (or even search engines apparently).