Sinus Honoris is located along the western edge of the Mare Tranquillitatis located on the surface of the near side of the moon. Where the bay joins the mare, rille systems extend to the north and south. The northern system is designated Rimae Maclear, after the crater Maclear just to the east of the bay. (wikipedia entry)
A sinus is a small plain. On the Moon they are named after latin terms describing weather and other abstract concepts.