Bantry Bay is the largest of the long marine inlets in south-west Ireland. It is approximately 35 km long, running in a south-west to north-easterly direction. The entrance to the bay is approximately 10 km wide, steadily narrowing to 3-4 km at its head. Bere Island, situated on the north shore adjacent to CastletownBere, and Whiddy Island lying near the head of the bay on the southern shore are the two largest islands in the bay.

Latitude: 51°42'N Longitude: 009°28'W 
UNCTAD code: IEBYT