This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Sasanian Empire alternate background . Bathymetry and shaded relief data colour adjusted for work in progress map of Sasanian Empire naturalearthdata naturalearthdata naturalearthdata Digital data and background raster from naturalearthdata www naturalearthdata all of which is in the public domain naturalearthdata map