Unlike surrounding mountains, Roundtop Hill is not part of an extended ridge system, and is only about in length. It is located just under from the crest of
Tonoloway Ridge, about southwest of Hancock. Its presence causes a large bend in the
Potomac River, which curves around its eastern slope. Much of the eastern face is part of the
Chesapeake and Ohio Canal National Historical Park and the canal bed and tow path pass along the narrow bank at its base. ==Geology==