We shall observe that we have in this description an _island_ at the mouth of a river. Whether the island was large or small, whether it was round, square, cuneiform, broad, narrow, high or low, we are not told. It was simply an island, and of it we have no further description or knowledge whatever. Their ship was anchored in what they call a _sound_, between the island and a promontory or tongue of land which ran out to the eastward. The breadth or extent of the sound at high water, or at low water, is not given. It may have been broad, covering a vast expanse, or it may have been very small, embraced within a few square rods. It was simply a sound, a shallow piece of water, where their ship was stranded at low tide. Of its character we know nothing more whatever. Then we have a _river_. Whether it was a large river or a small one, long or short, wide or narrow, deep or shallow, a fresh water or tidal stream, we are not informed. All we know of the river is that their ship could be floated up its current at least at high tide. The river flowed out of a _lake_. No further description of the lake is given. It may have been a large body of water, or it may have been a very small one. It may have been only an enlargement or expansion of the river, or it may have been a bay receiving its waters from the ocean, rising and falling with the tides, and the river only the channel of its incoming and receding waters. On the borders of this lake, or bay, or enlargement of the river, as the case may have been, they built their _houses_; whether on the right or left shore, whether near the outlet, or miles away, we know not. It is easy to see how difficult, how impossible, it is to identify the landing-place and temporary abode of the Northmen on our coast from this loose and indefinite description of the sagas. In the nearly nine hundred years which have passed since the discovery of this continent by these northern explorers, it would be unreasonable not to suppose that very great changes have taken place at the mouth of the rivers and tidal bays along our Atlantic coast. There is probably not a river's mouth or a tidal inlet on our whole eastern frontier, which has not been transformed in many and important features during this long lapse of time. Islands have been formed, and islands have ceased to exist. Sands have been drifting, shores have been crumbling, new inlets have been formed, and old ones have been closed up. Nothing is more unfixed and changeable than the shores of estuaries, and of rivers where they flow into the ocean.