A fine example of a long barrow in a good state of preservation. The depression on it was almost certainly made by the medieval beacon. {1}{2} The long barrow is 275 feet long, with a maximum width of 64 feet and a height of 7 feet. {1} The Neolithic long barrow in Beacon Plantation is the largest example of extant Lincolnshire long barrows. It is aligned south-east to north-west and, at the south-eastern end, stands to a height of 2.15m, tailing off to the north-west. The mound has been disturbed at the south-eastern end, which is thought to have been the site of a medieval beacon. The mound reduces rapidly, giving the barrow a tadpole-like shape. It is traversed by saddles, the first approximately 26m from the south-eastern end and the second about 21m from the north-western end. From here the tail of the barrow changes axis in a westerly direction, a feature which has been noted at Giant's Hills Long Barrow, Skendleby and also at Thorganby. The monument is well preserved and, while the two saddles which cross the mound were previously believed to indicate excavation, it is now thought that they represent the positions of internal structures which have collapsed. The monument will retain rare and valuable archaeological information relating to the sequence of burial rites and the dating and method of construction. Organic material retained in and under the mound and in the ditch fills will preserve environmental evidence concerning the nature of the landscape in which the monument was set. It is situated approximately 600m north-east of the prehistoric trackway now formalised as the Bluestone Heath Road, and the eastern side of the valley of one of the tributaries of the Great Eau. See the revised scheduling document 27860. {3} The long barrow is situated on the tip of a high ridge, overlooking the valley of the Great Eau, aligned south-east to north-west, and with its long axis traversing the contours. It is a trapezoidal mound standing to a height of 2m. At the south end the mound has been truncated and adapted allegedly for use as a medieval beacon. The terminal mound probably represents a round barrow, reused at a later date. {5}