31. The sides are very steep and the top is flat, indicating that it almost certainly contains a passage grave . 32. "' Townleyhall passage grave "'is a chamber tomb located around 2 km north of Dowth tomb. 33. The passage grave is known as Calliagh Birra's House and the small lake is called Calliagh Birra's Lough. 34. Mullyash Kerbed Cairn is a stepped two-tiered kerbed cairn or bowl barrow, or possibly a kind of passage grave . 35. In Lebor Gab�la �renn, the Tuatha D?Danann are closely associated with the ancient passage graves of Br?na B�inne such as Newgrange 36. The entrance passage and the burial chamber are distinguished by sill stones however meaning that they are part of the passage grave tradition. 37. Although many passage graves showed evidence of continued activity into the Late Neolithic period, La Hougue Bie was abandoned before that time. 38. Passage graves are usually cairns containing a passage leading to a central corbelled-roofed chamber, which is sometimes a cruciform shape.39. The prehistoric Bryn Celli Ddu, considered to be one of Wales's finest passage graves , is located from the river. 40. In this respect, a long barrow is a long tumulus, usually constructed on top of several burials, such as passage graves .
