Seive Dale Fen
Seive Dale Fen is a Site of Special Scientific Interest within North York Moors National Park in North Yorkshire, England. The site was designated as a protected area in 1983 because of its fen vegetation that receives water from springs. Plant species include tawny sedge, flea sedge, common sundew, marsh arrow-glass and marsh helleborine.
Part of the land is owned by the Duchy of Lancaster.