The Portal Tombs of Malin More (Irish: Málainn Mhóir) near Glencolumbkille in County Donegal, Ireland, form a line of six dolmens stretching over a distance of approximately 90 meters. There are indications that these megalithic structures were originally covered by a single straight cairn. The Portal Tombs are dated to the late Neolithic period. Portal tombs are megalithic structures found on the British Isles, characterized by two equally tall, upright stones with a door stone in between, forming the front of a chamber covered by a partially massive capstone. All the sites, numbered from west to east, fell victim to early Christian destruction. Each set of three tombs is located in separate fields, and they are designated as Irish National Monuments.