Haslar Marina is located inside Portsmouth Harbour

Portsmouth Harbour

Portsmouth Harbour is a large natural harbour in Hampshire, England. Geographically it is a ria: formerly it was the valley of a stream flowing from Portsdown into the Solent River. The city of Portsmouth lies to the east on Portsea Island, and Gosport to the west on the mainland...

, on the south coast of England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

, just to the west of the entrance. It can be easily identified by the bright green lightvessel

Lightvessel

A lightvessel, or lightship, is a ship which acts as a lighthouse. They are used in waters that are too deep or otherwise unsuitable for lighthouse construction...

Mary Mouse II permanently moored to the outside of its breakwater. The lightship contains a small bar and restaurant, as well as one set of shower, toilet and laundry facilities. (Others are located elsewhere in the marina.) Visitors' berths are near the entrance by the lightship.