Located very near the eastern most star in the belt of Orion the Hunter, at an approximate distance of 1,500 light-years, is the large emission nebula IC434. The Horse Head Nebula, designated B33, is a dark cloud of obscuring matter silhouetted against the bright red of IC434. Another prominent object is the Blue reflection nebula (NGC 2023) which is located below and to the left of the Horse Head.
1http://en.wikipedia.org/wiki/Horsehead_Nebula