The National Trust is initiating a legal challenge to the decision to grant planning permission for a major golf resort and hotel development on green field land at Runkerry.
The conservation charity is seeking leave for a judicial review of the decision to give the go ahead for the development on land between Bushmills and the Giant's Causeway World Heritage Site.
A spokesman said: "The National Trust has consistently opposed the planning application and in particular has expressed concern that the entire development is on land which is zoned in the draft Northern Area Plan as the distinctive landscape setting of the World Heritage Site in which no development should take place.
"This is based on a recommendation by UNESCO - the body responsible for World Heritage designations - that there should be a buffer zone to protect the special landscape surrounding the Causeway.
"Having carefully considered all the information relating to the planning decision, there remain fundamental issues of concern. We therefore have no option but to seek leave for a judicial review, so that the decision could be given the fullest possible consideration."
For more information about the National Trust, please visit www.nationaltrust.org.uk