This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionEstablishment of the Tang Dynasty.svg
English: Map of China during the period of transition from the Sui to the Tang, with the major regional rulers and contenders for the throne, and the main military activities of the Tang (in red) and their various rivals (in purple).
Geophysical map taken from DEMIS Mapserver, which are public domain, other wise self-made. Sources: D.A. Graff, Medieval Chinese Warfare, 300–900. Routledge 2002, pp. 162–178; H.J. Wechsler, "The founding of the T'ang dynasty: Kao-tsu (reign 618–26)" in The Cambridge History of China, Volume 3: Sui and T'ang China, 589–906, Part I. Cambridge University Press 2008, pp. 162–168.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible licence as the original.