The beautiful book referred to: Sensing the Earth – Messages from the Wisdom Keepers Edited by Peter Knight and Sue Wallace – www.stoneseeker.net
Here is the edited text from the Wikipedia article on the River Brue:
The River Brue originates in the parish of Brewham in Somerset, England, and reaches the sea some 31 miles west at Burnham-on-Sea. It originally took a different route from Glastonbury to the sea, but this was changed by Glastonbury Abbey in the twelfth century. The river provides an important drainage route for water from a low-lying area which is prone to flooding which man has tried to manage through rhynes, canals, artificial rivers and sluices for centuries.
The River originates in hills close to the border with Dorset. It descends quickly in a narrow valley to a point just beyond Bruton where it is joined by the River Pitt. Here it takes a meandering route through a broad, flat-bottomed valley between Castle Cary and Alhampton. It passes Glastonbury, where it acts as a natural boundary with nearby village of Street, before flowing in a largely artificial channel across the Somerset Levels and into the River Parrett at Burnham-on-Sea.
The area is known to have been occupied since the Neolithic when people exploited the reedswamps for their natural resources and started to construct wooden trackways such as the Sweet Track. The Sweet Track, named after the peat digger who discovered it in 1970 is the world’s oldest timber trackway, built in the early 4th millennium BC.
Near the Brue is the best-preserved prehistoric village in the UK – Glastonbury Lake Village – once inhabited by about 200 people living in 14 roundhouses, and built on an artificial foundation of timber filled with brushwood, bracken, rubble and clay. In the Romano-British period, the Brue formed a lake just south of the hilly ground on which Glastonbury stands. According to legend 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.