DALKEY, a small port and watering place of Co. Dublin, Ireland, 9 m. south-east of Dublin by rail. Pop. of urban district (5926), 4,135. It is situated on and about Sorrento point, the southern horn of Dublin bay. The 15th century castle has been restored for use as offices. There are ruins of an old church dedi cated to St. Begnet, perhaps a diminutive form of Bega, but the identity is not clear. The harbour was once a landing-place of some importance.