Diamantina Fracture Zone western side of the Diamantina Fracture Zone at is another, larger pit, named Dordrecht Hole, with a north-south extent of 50 km. Its maximum depth is 7079 m at . "Dordrecht" was the name of a vessel of the Dutch East India Company, which explored the Australian west coast in 1619 and discovered the Houtman Abrolhos. The shallowest point in the area is the 1125-metre point in the Broken Ridge close to Ninety East Ridge. Diamantina Fracture Zone The Diamantina Fracture Zone is an area of the south-eastern Indian Ocean seafloor. It has a range of ridges and trenches. It
Hjort Trench below sea level. To the east, the Hjort ridge follows the general curve of the trench, separating the trench from the Hjort Plateau. The Hjort trench lies in an area of transpression where the plate boundary transitions from a transform boundary to a convergent one. As such, this region provides an example of how a transform boundary with a vertical or near-vertical transform fault becomes an area of under-thrusting. Hjort Trench The Hjort Trench is a linear topographic depression south of Macquarie Island in the southwest Pacific Ocean. Geologically, the depression is considered to be the seafloor expression of an