"large regions" is correct and usable in written English.
You can use it when referring to geographical areas. For example, "The drought has affected large regions of the Middle East."
Large regions of cortex show a radial diffusion orientation.
Polls show that the Front National could ultimately take control of at least two large regions.
Some economists say large regions will maximize competition among health plans, driving costs down.
The Middle South (Virginia, North Carolina, Tennessee and Arkansas) contained large regions of nonslaveholding whites.
Several large regions of the country were then opened to competitive bidding.
Chromatin conformation can spread over large regions of the genome.
We find corresponding loci where selection is evident over large regions incorporating multiple genes.
Climate change unfolds on time scales of decades and over very large regions, by comparison.
Large regions were imaged as tiles and stitched using ZEN Blue software.
This is because the HRC bad pixel files have large regions marked bad around the edge.
Large regions may fail due to insufficient memory for the algorithm.
