The basalt columnar joints of the north coast on Yuanbei are well developed, among which, the stone pen and stone ink holder is most renowned; the east coast of Yuanbei islet has a piece of flat columnar basalt, with its surfaces full of wrinkles just like a pleated skirt; this is a place visitors know for its " one pen, one ink holder, one skirt " view, currently listed as the Basalt Reservation Area.
