Farnham Geological Society is an active organisation in the town, and the Museum of Farnham has a collection of geological samples and fossils.
Farnham lies in the valley of the North Branch of the River Wey, which rises near Alton, merges with the South Branch at Tilford, and joins the River Thames at Weybridge.
Near the Bourne Spring two Roman buildings were discovered; one was a bath-house dating from about AD 270 and the other a house of later date. William Stukeley propounded that Farnham is the site of the lost Roman settlement of "Vindomis", although this is now believed to be at Neatham, near Alton.Farnham is the largest town in Waverley, and one of the five largest conurbations in Surrey.It is of historic interest, with many old buildings, including a number of Georgian houses. A short distance southeast of the town centre are the ruins of Waverley Abbey, Moor Park House and Mother Ludlam's Cave. It is drained by the River Wey (North Branch) which is navigable only to canoes at this point.During the Roman period the district became a pottery centre due to the plentiful supply of gault clay, oak woodlands for fuel, and good communications via the Harrow Way and the nearby Roman road from Silchester to Chichester.Kilns dating from about AD 100 have been found throughout the area, including Six Bells (near the Bourne Spring), Snailslynch and Mavins Road, but the main centre of pottery had been Alice Holt Forest, on the edge of the town, since about AD 50, just 7 years after the arrival of the Romans.