Rosia Bay is the only natural harbour in Gibraltar, the British Overseas Territory at the southern end of the Iberian Peninsula.

Rosia Bay was the site of the Royal Navy Victualling Yard complex which was constructed in the early 19th century, allowing vessels to anchor and obtain provisions, including food and water.

Vice Admiral Horatio Nelson obtained supplies for his Mediterranean Fleet at Rosia Bay.

Rosia Bay is located along the southwestern coast of Gibraltar, the British Overseas Territory at the southern end of the Iberian Peninsula.

That year, the historic Rosia Water Tanks were demolished by the Government of Gibraltar, despite vocal public opposition, to enable construction of a large building, Nelson's View, which contained affordable housing units.

After the demolition of the tanks in 2006 and the subsequent construction of the Nelson's View development, the owners of the cottages were left with a large building which towered directly behind their homes.

It formed part of the Royal Navy base and contained stores of food, water, and clothing in sufficient quantities for a large fleet.

The Rosia Mole was the berthing place for the Royal Navy vessels seeking provisions and water from the Victualling Yard complex; it also held coal for the garrison.

[10][15] Over the years, the British built gun batteries that overlooked Rosia Bay to protect the harbour from attacking vessels.

The defensive wall and batteries at the east side of Rosia Bay, including a pair of rifled muzzle loading guns, are also listed with the trust.