range thought to be the subduction arc of the African Plate under the Anatolian Plate. The Strabo Trench does not connect with it. Instead there is a gap, the Rhodian Basin. On its north boundary is the Rhodian Fault, trending NNE, and making the final connection to the Anatolian Fault. Length of the Hellenic trough The linear distance of around the trough depends on its definition. Various estimates are available. The main requirements for definition are two end points and the shape of the path between them. One source specifying end points of “ offshore the island of Zakynthos” and “ offshore of the island of Rhodes” offers an arcuate distance of for “the arc,” here used loosely. Neither coordinates are on or next to the Hellenic Arc; rather, the line (approximated by the method of small straight segments on the map) to achieve 1200 km must follow the outer edge of the foredeep zone, located toward the midline of the Hellenic Trough. Being further out on the radius of the Arc as a segment of a circle, it has a longer peripheral distance. In this definition “the arc” is both the Hellenic Arc and its foredeep, measured on the outer periphery. The northern end point is more solid, being located on or near the Cephalonia-Lefkada Transform Fault Zone, generally agreed to be the northern edge of the subduction zone. The southern end point is placed arbitrarily in the Rhodes Basin at the end of the Hellenic subduction. No point chosen there would cause significant variation in the 1200 km length. Another source concentrates on the line of subduction, which is an angle at the intersection of two roughly straight lines (see article above). The vertex is to the south of Crete. A leg bears to the NW from there and is long. The line is a scarp, though not visible because the trench has filled with sediment. A second leg bears to the NE and is long, for a total of , which is also the southern peripheral distance around the Hellenic Arc. The Arc is arcuate; the angle is straight lines, another paradox, if one assumes a single subduction. The general geologic answer is that the subduction due to the compression of Africa against Eurasia is a different movement from the southward thrusting of the Aegean Plate. There are two different resultants of all the small motion vectors.