As-grown surfaces of (110) oriented laser-ablated YBa 2 Cu 3 O y films have been investigated by scanning tunneling microscopy and spectroscopy, for the first time, at room temperature and 4.2 K. We found semi-macro scale surface structures along the c-axis, which were composed of (110) top planes and (100)/(010) lateral planes. The orthorhombic atomic lattice image, corresponding to Cu atom arrangement of both CuO 2 double layers and CuO chain layers alternately, was observed on the (110) top plane at 4.2 K. Furthermore, broad swell-and-depression structures were observed as stripes perpendicular to the c-axis on the top plane. The STS results indicated superconducting nature on the swells and semiconducting nature on the depressions.