Spire of Dublin pictures and construction record (http://www.irish-architecture.com/buildings_ireland/dublin/northcity/oconnell_street/spire)
... total area of 4.4 km² (1.7 mi²). 3.3 km² (1.3 mi²) of it is land and 1.1 km² (0.4 mi²) of it is water. The total area is 25.44% water. ...