high ramparts and they retain all their principal gateways. They incorporate part of the walls of the Roman fortress and some Norman and medieval work, as well as 19th- and 20th-century renovations. The entire circuit is approximately , and encloses an area of . The north-east section includes a part where walls never existed, because the Norman moat of York Castle, formed by damming the River Foss, also created a lake which acted as a city defence. This lake was later called the King's Fishpond, as the rights to fish belonged to the Crown. A feature of central York is the Snickelways, narrow pedestrian routes, many of which led towards the former market-places in Pavement and St Sampson's Square. The Shambles is a narrow medieval street, lined with shops, boutiques and tea rooms. Its unusual name comes from an old English term for an open-air slaughterhouse or meat market. Most of these premises were once butchers' shops, and the hooks from which carcasses were hung and the shelves on which meat was laid out can still be seen outside some of them. The street also contains the Shrine of Margaret Clitherow, although it is not located in the house where she lived. Goodramgate has many medieval houses including the early-14th‑century Lady Row built to finance a Chantry, at the edge of the churchyard of Holy Trinity church. Pubs In June 2015 York CAMRA listed 101 pubs on its map of the city centre, some of which are hundreds of years old. These include the Golden Fleece, Ye Olde Starre Inne, noted for its sign which has spanned the street since 1733, and The Kings Arms, often photographed during floods. On 18 June 2016, York CAMRA undertook a "Beer Census" and found 328 unique real ales being served in over 200 pubs in York, reinforcing the city's reputation as a top UK beer destination. Tea Rooms In the centre of York, in St Helen's Square, there is the York branch of Bettys Café Tea Rooms. Bettys' founder, Frederick Belmont, travelled on the maiden voyage of the Queen Mary in 1936. He was so impressed by the splendour of the ship that he employed the Queen Mary's designers and craftsmen to turn a dilapidated furniture store in York into an elegant café in St Helen's Square. A few years after Bettys opened in York war broke out, and the basement 'Bettys Bar'