Glastonbury - Geography

Geography

The walk up the Tor to the distinctive tower at the summit (the partially restored remains of an old church) is rewarded by vistas of the mid-Somerset area, including the Levels which are drained marshland. From there, on a dry point, 158 metres (518 ft) above sea level, it is easy to appreciate how Glastonbury was once an island and, in the winter, the surrounding moors are often flooded, giving that appearance once more. It is an agricultural region typically with open fields of permanent grass, surrounded by ditches with willow trees. Access to the moors and Levels is by "droves", i.e., green lanes. The Levels and inland moors can be 6 metres (20 ft) below peak tides and have large areas of peat. The low lying areas are underlain by much older Triassic age formations of Upper Lias sand that protrude to form what would once have been islands and include Glastonbury Tor. The lowland landscape was formed only during the last 10,000 years, following the end of the last ice age.

The low lying damp ground can produce a visual effect known as a Fata Morgana. This optical phenomenon occurs because rays of light are strongly bent when they pass through air layers of different temperatures in a steep thermal inversion where an atmospheric duct has formed. The Italian name Fata Morgana is derived from the name of Morgan le Fay, who was alternatively known as Morgane, Morgain, Morgana and other variants. Morgan le Fay was described as a powerful sorceress and antagonist of King Arthur and Queen Guinevere in the Arthurian legend.

Glastonbury is less than 1 mile (2 km) across the River Brue from the village of Street. At the time of King Arthur the Brue formed a lake just south of the hilly ground on which Glastonbury stands. This lake is one of the locations suggested by Arthurian legend as the home of the Lady of the Lake. Pomparles Bridge stood at the western end of this lake, guarding Glastonbury from the south, and it is suggested that it was here that Sir Bedivere threw Excalibur into the waters after King Arthur fell at the Battle of Camlann. The old bridge was replaced by a reinforced concrete arch bridge in 1911.

Until the 13th century, the direct route to the sea at Highbridge was prevented by gravel banks and peat near Westhay. The course of the river partially encircled Glastonbury from the south, around the western side (through Beckery), and then north through the Panborough-Bleadney gap in the Wedmore-Wookey Hills, to join the River Axe just north of Bleadney. This route made it difficult for the officials of Glastonbury Abbey to transport produce from their outlying estates to the abbey, and when the valley of the River Axe was in flood it backed up to flood Glastonbury itself. Some time between 1230 and 1250 a new channel was constructed westwards into Meare Pool north of Meare, and further westwards to Mark Moor. The Brue Valley Living Landscape is a conservation project based on the Somerset Levels and Moors and managed by the Somerset Wildlife Trust. The project commenced in January 2009 and aims to restore, recreate and reconnect habitat, ensuring that wildlife is enhanced and capable of sustaining itself in the face of climate change, while guaranteeing farmers and other landowners can continue to use their land profitably. It is one of an increasing number of landscape scale conservation projects in the UK.

The Ham Wall National Nature Reserve, 4 kilometres (2.5 mi) west of Glastonbury, is managed by the Royal Society for the Protection of Birds. This new wetland habitat has been established from out peat diggings and now consists of areas of reedbed, wet scrub, open water and peripheral grassland and woodland. Bird species living on the site include the Bearded Tit and the Bittern.

The Whitelake River rises between two low limestone ridges to the north of Glastonbury, part of the southern edge of the Mendip Hills. The confluence of the two small streams that make the Whitelake River is on Worthy Farm, the site of the Glastonbury Festival, between the small villages of Pilton and Pylle.