From the publisher:
ARC: A Region Charted map pack is a set of 10 full-color maps, each 18" by 24" intended for use in any fantasy game. Each map is a stand alone encounter location, but many maps also connect together allowing you to expand the encounter. With your support, we hope to release additional map packs and grow the region, adding value to all the maps you already own with each new expansion.
about the package
There are 10 maps, each 18 inch by 24 inch presented in duplicate (with grid and without grid) and then another 10 pages of GM aids to assist in encounter design.