What is the low area in which oceans formed?

The low area in which oceans formed are called ocean basins. Ocean basins are large areas of the Earth's crust that are covered by water. They are made up of the continental shelves, the continental slopes, and the abyssal plains. The continental shelves are the shallow parts of the ocean basins, and they extend from the shoreline to the edge of the continental slope. The continental slopes are the steep parts of the ocean basins, and they connect the continental shelves to the abyssal plains. The abyssal plains are the deep, flat parts of the ocean basins. They are located between the continental slopes and the mid-ocean ridges.