There are various other small islets and skerries in the Firth. Along the north shore, from west to east, Preston Island near Culross is an artificial former island. This reclaimed land was created c. 1800 for salt production. More land was then reclaimed using ash slurry from Longannet power station from 1970 onwards and it is now part of the mainland. Just offshore are the Craigmore Rocks at , which were called "Kraig Maur" in Blaeu's Atlas. "Dow Kraig" on the same 17th century map appears to be under reclaimed land just along the coast south of Dunsyre House at Nearby Rosyth Castle is a former tidal island and Long Craig is now part of the Forth Road Bridge.