n. in. c. ii. 5. SPAIN. 215 for many stadia. These are filled by the approach of the sea at high tide, and may be navigated as easily, or even more so than rivers. They are navigated much the same as rivers ; the sea, meeting with no obstacle, enters like the flow of a river at flood-tide. The sea comes in here with greater force than in the other places ; for being forced from the wide ocean in- to the narrow strait, 1 formed by the coast of Maurusia and Iberia, it experiences recoils, and thus is borne full into the retiring parts of the land. Some of these shallows are left dry as the tide ebbs, while others are never destitute of water ; others again contain islands, of this kind are the estuaries between the Sacred Promontory 2 and the Pillars, where the tide comes in with more violence than at other places. Such a tide is of considerable advantage to sailors, since it makes the estuaries both fuller and more spacious, frequently swell- ing them to a breadth of eight 3 stadia, so that the whole land, so to speak, is rendered navigable, thus giving wonderful facility both for the export and import of merchandise. Nevertheless there is some inconvenience. For in the navigation of the rivers, the sailors run considerable danger both in ascend- ing and descending, owing to the violence with which the flood-tide encounters the current of the stream as it flows down. The ebb-tides are likewise the cause of much damage in these estuaries, for resulting as they do from the same cause as the flood-tides, they are frequently so rapid as to leave the vessel on dry land ; and herds in passing over to the islands that are in these estuaries are sometimes drowned [in the passage] and sometimes surprised in the islands, and en- deavouring to cross back again to the continent, are unable, and perish in the attempt. They say that certain of the cattle, having narrowly observed what takes place, wait till the sea has retired, and then cross over to the main-land. 5. The men [of the country], being well acquainted with the nature of these places, and that the estuaries would very well answer the same purpose as rivers, founded cities and other settlements along them the same as along rivers. Of this number are Asta, Nebrissa, 4 Onoba, 5 Ossonoba, Maenoba, 1 Of Gibraltar. 2 Cape St. Vincent. 3 The text here is evidently corrupt, but it is not easy to determine to what extent the overflow reached at the time Strabo wrote. 4 Lebrixa. 5 Gibraleon.
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