The cut edges of the escarpment forming the Hog's Back and North Downs on the north, and the South Downs on the south, meet the sea in the fine promontories of the South Foreland and Beachy Head.
Pytheas's notice of the depth of the Bay of Biscay, of the length of the projection of Brittany, of Ushant under the name of Uxisama, and of three promontories of Britain, two of which seem to correspond to Land's End (Beler'ion), and North Foreland (Kantion), must not be forgotten.
The coast-line consists of a succession of great promontories alternating with deep inlets.
It is unique, however, among the great promontories of the south coast of England, the accretion of gravel banks falling into deep water contrasting with the cliff-bound headlands of the North Foreland, Beachy Head and the Lizard, and with the low eroded Selsey Bill, off which the sea is shallow.
These inclinations are not whimsical usually, but their form, size, and direction are determined by the promontories of the shore, the ancient axes of elevation.
In shape it is roughly triangular,' whence the ancient poetical name of Trinacria, referring to its three promontories of Pelorum (now Faro) in the north-east, Pachynum (now Passero) in the south-east, and Lilybaeum (now Boeo) in the west.
The south, springing east of Euphrates in the Armeno-Kurdish highlands, and being prolonged into the Aegean Sea by rocky promontories and islands.
The monotonous Atlantic littoral is unbroken by any large inlet or estuary, and thus contrasts in a striking manner with the varied outlines of the Pacific coast, which includes the three bold promontories of Nicoya, Golfo Dulce and Burica, besides the broad sweep of Coronada Bay and several small harbours.
Numerous small archipelagoes and islands, of which the chief are Belle Tie, Groix and Ushant, fringe the Breton coast.- North of the Bay of St Michel the peninsula of Cotentin, terminating in the promontories of Hague and Barfleur, juts north into the English Channel and closes the bay of the Seine on the -west.
If the development of secondary tissues is to proceed further, arcs of cambium are formed in the pericycle external to the primary xylems, and the two sets of cambial arcs join, forming a conti,riuous, wavy line on transverse section, with bays opposite the primary phloems and promontories opposite the primary xylems. Owing to the resistance offered by the hard first-formed secondary xylem, the bays are pushed outwards as growth proceeds, and the wavy line becomes a circle.