The British National Trust has warned that rising sea levels and stormy weather may damage the Giant's Causeway in Co Antrim.
The organisation says other coastal areas in the North could also be lost as the sea level is expected to rise by up to one metre this century.
The trust says access to the Giant's Causeway could become more difficult, with problems becoming evident as early as 2020.
The over-wintering of Brent Geese in Strangford Lough could also be affected as the mud flats near Newtownards could be flooded.