Sandwich Bay is a long sweeping inlet of the sea between Ramsgate and Deal, on the east coast of Kent, England. The coastal area consists of sand flats with their associated salt marshes and coastal sand dunes. The Sandwich Flats stretch for about five miles (8 km) along the coast. The coastal habitats are of very high ecological importance.
Most of the bay bears national and international nature conservation designations. These include the Sandwich Bay to Hacklinge Marshes Site of Special Scientific Interest (SSSI), the Sandwich Bay Special Area of Conservation (SAC), the Thanet Coast and Sandwich Bay Special Protection Area for birds (SPA), and the Thanet Coast and Sandwich Bay Ramsar Site. The Southern Emerald damselfly (Lestes barbarus) was found here in 2003, only the second site in Great Britain at which this vagrant species had occurred. There are several Geological Conservation Review sites within the SSSI. The bay is also home to the Sandwich Bay Bird Observatory Trust and the Monk's Wall nature reserve.
The sand dunes at the top of the beach give way to the private road leading through Sandwich Bay estate. There is a daily toll on this road for non-resident motorists of £7.00 per car or £4.00 per motorcycle (2013) but cyclists and pedestrians pass for free, and charges only apply during the day, with the tolls closing around 6 pm. The road itself runs along on the top of a concealed sea wall separating the beach from the golf courses which back onto it. Via the toll road the beach is only 3–5 minutes from the historic Cinque port town of Sandwich. There are also scenic footpaths leading from the Quay in Sandwich, along the river and over the golf course on the dunes to the bay, which can take anything from 30 minutes to 1 hour to walk. Cycling over this route is not advisable due to the length of the path situated upon the dunes and golf-course, but the road route takes only 10 minutes by bicycle.