The 1968 excavations were a continuation of the investigations that have been in progress at Knowth since 1962. In brief, this work is establishing that there is a cemetery of Passage Graves at Knowth. This consists of the large tumulus (Site I) with a number of smaller tombs in its immediate vicinity. This group is situated on a low hill that on the west overlooks the River Boyne at a point a couple of miles downstream from Slane where the river takes a sharp turn to the left [I]. MAIN MOUND At Knowth a tract of land that is close to a halfmile in length and one fifth of a mile in greatest width (c. 800 m. x 340 m.) is above the 200-ft. contour (60 m.) but even the highest part of this is only slightly over the 200-ft. mark. The large mound is situated towards the north-western extremity of this ridge and the smaller tombs are