The main view is inverted relative to the sketchbook’s foliation, and continues across folio 74 recto opposite (D20711; Turner Bequest CCXXVI 71). The viewpoint is the mouth of the River Medina off Cowes Castle (see under folio 72 verso; D20708; Turner Bequest CCXXVI 69a), seen to the east on the right, and the panoramic prospect runs south-west along the shore at Cowes here before extending south-eastwards across to East Cowes on the other page. There are figures in rowing boats here, and a moored sailing boat with bunting. Compare the setting of the painting East Cowes Castle, the Seat of J. Nash, Esq.; the Regatta Starting for their Moorings, exhibited at the Royal Academy in 1828 (Victoria and Albert Museum, London).1
At the top centre is a small study of a cluster of rowing boats moored off the shore, and at the top left a quick sketch of a yacht under way, with a note of colours beside it. For more on studies in this sketchbook relating to the regatta events at Cowes from late July 1827 onwards, see the Introduction.
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, pp.150–1 no.243, pl.247 (colour).