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Doire na Fuaran was an enclosed area below Slugach immediately east of Fasag or Fassaig and part of Torrodon. They were stone and turfed walled, thatched roofed houses. Folk were cleared to Fasag, Annat or Alligin for sheep after 1871 census, Anglicised to Derry and in 1881 census some folk recorded on Derry Road and Derry no longer in 1891 census.
Great information on these two links especially the National Trust report:

https://canmore.org.uk/site/105067/torridon-doire-na-fuaran-ballamian

https://librarylink.highland.gov.uk/LLFiles/9379/full_9379.pdf