A distinctive feature of the centre of Lewes is the network of alleyways or 'twittens' which run north–south on either side of the High Street and date back to Anglo-Saxon times. According to the Dictionary of the Sussex dialect and collection of provincialisms in use in the county of Sussex published in Lewes in 1875. "Twitten is a narrow path between two walls or hedges, especially on hills. For example, small passageways leading between two buildings to courtyards, streets, or open areas behind". Some twittens (e.g. Broomans Lane, Church Twitten, Green Lane, Paine's Twitten) remain flint-wall-lined pedestrian thoroughfares, others (e.g. Watergate Lane, St Andrew's Lane and renamed Station Street (formerly St Mary's Lane)) are now narrow usually one-way roads. The most notable of all Lewes' twittens is Keere Street. A weekly Sunday morning run up and down all the twittens on the south side of the High Street – the so-called Twitten Run – has operated in the town since November 2015.