Cape Cod, then, is the only cape north of Sandy Hook which corresponds to the description in the Saga, and near here we should look for Vinland, leaving the southern shores until later. Vinland, which was discovered by Leif Erikson, is only described as _Vinland_ in the Flat Island Book. This account states that Leif Erikson's party "came to a certain island which lay north of the land." That Leif Erikson should have thought that Cape Cod was an island is obvious, because it is impossible from the cape to see the southern shore of Massachusetts Bay twenty miles away. There is no need to explain why he also believed it to lie north of the land, as no one and final answer can be given, although several can be easily suggested; that water and land again lay to the west is clearly stated in all three accounts. Afterward "they sailed into that sound which lay between the island and the promontory which jutted northward from the land; they steered in westward past the promontory. There was much shallow water at ebb tide, and then their ship stood up and then it was far to look to the sea from their ship." Across the water which lies between Cape Cod and the mainland is Rocky Point, a high and therefore noticeable promontory jutting northward from the land. Past this one can only continue westering to the north, and thence we must now look along the land to find the place where, in the words of the Flat Island Book, "a certain river flowed out of a certain lake," having, as was said before, great shallows at its mouth at ebb tide, whence it was far to look to the ocean. Following round the inner coast of Cape Cod, we pass Plymouth and on to Boston before we find in the Charles River and Boston Back Bay a river flowing through a lake into the sea, where great shallows at its mouth are a conspicuous feature and it is far to look to the ocean. At this point we may add one more feature to the description of Keel Cape--that it appears to be an island when approached from the north. Now we can continue our search down the North Atlantic coast, noting that Sandy Hook is not scored with bays at the south, and that Cape Henlopen and Cape Henry could not have been mistaken for islands.[12] [Footnote 12: Chart of North Atlantic, No. 98. Norie & Wilson, London.] There is one event described in all three versions of the Vinland story--the battle with the natives. According to the Flat Island Book, this battle took place in Vinland; according to the other two Sagas, Vinland was supposed to be north of Keel Cape. But in these Sagas it is said that this battle took place _south_ of Keel Cape, where Karlsefni had found a river flowing through a lake into the sea.