The phrase "continental regions" refers to large areas of land on a continent that share certain characteristics such as climate, geology, or ecosystems. Full definition
They also found a boundary 60 miles below the oldest continental regions but are not certain that it represents the base of the plates. (discovermagazine.com)
Extensive continental regions were flooded by shallow seas ranging in water depth from a few to little more than 100 metres (330 feet). (britannica.com)
The region between 45 degrees N and 65 degrees N saw the lowest ever concentrations of total atmospheric ozone over the three continental regions of North America, Europe and Siberia in the winter - spring months of 1992 and 1993. (newscientist.com)