High Quality Content by WIKIPEDIA articles! A roadstead is a place outside a harbor where a ship can lie at anchor. It is an enclosed area with an opening to the sea, narrower than a bay or gulf. It has a surface that cannot be confused with an estuary. It can be created artificially by jetties or dikes. Natural roadsteads offer shelter from storms and are frequently used for naval bases. Boulogne-sur-Mer is a city in northern France. It is a sub-prefecture of the department of Pas-de-Calais. The population of the city was 44,859 in the 1999 census, whereas that of the whole metropolitan area was 135,116. The name Boulogne was first recorded during the Roman Empire as Bononia, a derivative of the Celtic word bona (meaning "foundation", "settlement", "citadel"). This derivation is also found in the name of the Italian city of Bologna. "Sur mer" is French meaning "on the sea".

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