Map of the Parthian Empire under Mithridates II.
Own work using:

Sources I listed at en:w:Talk:Parthian_Empire/Archive_1#Boundaries_on_the_map, too lazy to write them down here at the moment.
The Iranian Expanse by Canepa
Olbrycht, Marek Jan 2009. "Mithridates VI Eupator and Iran, pp. 164–166, 170–171
Olbrycht, Marek Jan (2010). "The early reign of Mithradates II the Great in Parthia". pp. 151–153
Shayegan, M. Rahim (2011). Arsacids and Sasanians: Political Ideology in Post-Hellenistic and Late Antique Persia. pp. 116–118, 168
Kia, Mehrdad (2016). The Persian Empire: A Historical Encyclopedia [2 volumes]: A Historical Encyclopedia. pp. 55, 186 (need to find a better source to replace this in the future though).
Original file by Ro4444, edited by me