Optical recording medium having grooves and lands

An optical recording medium having grooves and lands alternately provided in a radial direction, information recording areas being formed in both of said grooves and said lands, and at least one prepit region where a groove is not formed between portions of said grooves;

• wherein, in said prepit region, first information marks are disposed on a virtual extension of a first boundary between one groove and one adjacent land and second information marks are disposed on a virtual extension of a second boundary between said one groove and an other adjacent land, said first and second information marks being disposed so as not to exist at opposing positions on both of said first and second boundaries of said one groove;
• wherein said first and second information marks include at least synchronous information;
• and
• wherein a trailing edge of said first information marks is aligned in the radial direction.