It was not completed, however, till the 19th century, when the west portal and towers and two bays of the nave were added, according to the plans of Violletle-Duc. The fine stained glass of the windows dates from the 13th to the 15th centuries.
The nave passes from Norman to Early English in the course of its eight bays from east to west and also from the arcade through the triforium to the clerestory.
The coastline is, in general, undefined and marshy, and broken into numerous bays and peninsulas.
South of Bahia Blanca is the sheltered bay of San Blas, which may become of commercial importance, and between the 42nd and 43rd parallels are the land-locked bays of San Jose and Nueva (Golfo Nuevo) - the first as yet unused; on the latter is Puerto Madryn, 838 m.
To the north as far as the rocky point of St Gildas, sheltering the mouth of~he Loire, the shore, often occupied by salt marshes (marshes of Poitou and Brittany), is low-lying and hollowed by deep bays sheltered by large islands, those of Olron and Re lying opposite the ports of Rochefort and La Rochelle, while Noirmoutier closes the Bay of Bourgneuf.
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