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The northern portion of middle Florida , between the Suwannee and Apalachicola Rivers , while corresponding in general altitude and topography to the central ridge , differs widely from all other parts of the State . The deficit of deep ridges is particularly startling : there were fewer than a quarter as many ridges of draft 9 m or greater in 1996 than in 1976 , which will have a major impact on the area-averaged strength properties of the ice cover . More interestingly , on either side of the central ridge we see slight depressions centered , for the 9 Bark channel , at about 0.38s and 0.67s . The central ridge is named the frog stay or spine of the frog and contains a furrow called the central sulcus or cleft . Blades are long and flat with central ridge and straight bevelled ends . The word " deangle " refers to the feminine character of this mask type , with its slit eyes , full lips , and central ridge down the forehead . It is occupied by many ridges , usually rising 100 to 200 meters above the separating valleys . ) : For many years , climbers from all over the Northeast have made the pilgrimage to New Hampshire to do this spectacular ridge — and with good reason . Beautifully frosted with a thick ridge of chocolate ganache , the cake was a mousselike tribute to Irish Cream liqueur - - and good . From the base of the first grand mountain plateau we can see the outstanding pines and sequoias 4000 feet above us , and We now ascend rapidly , sweeping from ravine to ravine around the brows of subordinate ridges . The United States has many watersheds of many sizes , and many , many ridges that define these drainage basins .