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Turner used the sketchbook in the portrait format in order to include the spire and southern tower (Tour de Beurre) in this view of Rouen Cathedral. The view is from the east, probably taken from the Rue des Bonnetiers, with the Archbishop’s Palace on the right. At the bottom of the page, where the sheet has been repaired, is the slight continuation of a sketch of Rouen from folio 22 verso (Tate D24542; Turner Bequest CCLVIII 22a), indicating that these two pages were originally bound next to each other in the sketchbook before John Ruskin disassembled it to display some of the pages (see the introduction to the sketchbook).
For a list of Turner’s sketches of Rouen in this book, see folio 1 (Tate D24500; Turner Bequest CCLVIII 1).