History of Lisbon francophile compatriots for the brutality and depredations of the French. Meanwhile, to control access to the capital, Wellington's chief engineer, Richard Fletcher, built the defensive lines known as the Lines of Torres Vedras across the peninsula on which Lisbon sits, using Portuguese workmen. Bounded by the Atlantic Ocean on one side and the Tagus on the other, the city was reachable only by a narrow stretch of land blocked by a range of hills stretching from Sintra to Torre Vedras, which since Roman times had marked the bounds of Lisbon's territory. Conceived by Fletcher and a Portuguese major, Neves Costa,
Atlantic Ocean variations, values may vary by . From October to June the surface is usually covered with sea ice in the Labrador Sea, Denmark Strait, and Baltic Sea. The Coriolis effect circulates North Atlantic water in a clockwise direction, whereas South Atlantic water circulates counter-clockwise. The south tides in the Atlantic Ocean are semi-diurnal; that is, two high tides occur during each 24 lunar hours. In latitudes above 40° North some east-west oscillation, known as the North Atlantic oscillation, occurs. On average, the Atlantic is the saltiest major ocean; surface water salinity in the open ocean ranges from 33 to 37