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This sketch is one of Turner’s four close-up sketches of Gylen Castle on Kerrera as seen from the west: folios 66–67 verso (D26870–D26873). Having sketched the castle from the same height on folio 67 verso, he then descended the cliffs a little way towards the bay of Port a’ Chaisteil to make the present sketch looking up the cliff-face to the castle ruin. To the right is the Firth of Lorn with the coast of Argyll in the distance. While Turner has not drawn the ruin or rocks in much detail, he has taken time with this sketch to draw clouds and add shading. His next view on folio 66 verso was made from a little further down the cliff.
For further information on Turner’s sketches of Gylen Castle, see folio 73 verso (D26885).