abstract:While Hogan's Onomasticon and the recent efforts to update it being carried out by the Locus Project at University College Cork have provided us with much information on the locations of the places mentioned in early Irish literature, that information has often been general (e.g. `in Muirthemne'). Only rarely have attempts been made to correlate the places with evidence present on the ground in the form of earthworks or other monuments. As part of an ongoing project whose aim is such identifications, a study was made of remains known to correlate with assembly places. Based on the types of monument associated with well-known oenach locations, it has been possible to show that such associations occur near a number of other sites as well.