This supposed "strait" was in fact the Rio de la Plata (or the San Matias Gulf). By "vndtere Presill", the Zeytung meant that part of Brazil in the lower latitudes, but Schöner mistook it to mean the land on the southern side of the "strait", in higher latitudes, and so gave to it the opposite meaning. On this slender foundation he constructed his circum-Antarctic continent to which, for the reasons that he does not explain, he gave an annular, or ring shape. In an accompanying explanatory treatise, "Luculentissima quaedam terrae totius descriptio" ("A Most Lucid Description of All Lands"), he explained:The Portuguese, thus, sailed around this region, the Brasilie Regio, and discovered the passage very similar to that of our Europe (where we reside) and situated laterally between east and west. From one side the land on the other is visible; and the cape of this region about 60 miles away, much as if one were sailing eastward through the Straits of Gibraltar or Seville and Barbary or Morocco in Africa, as our Globe shows toward the Antarctic Pole. Further, the distance is only moderate from this Region of Brazil to Malacca, where St. Thomas was crowned with martyrdom.