Map of part of Japan, showing the capital Nara and the eastern provinces (Azuma) during the Nara period
Own work, using

Coastline from Natural Earth 1:10m Physical Vectors
Province boundaries from Natural Earth 1:10m Cultural Vectors and
Kupchik, John E. (2011) A grammar of the Eastern Old Japanese dialects (PhD thesis), University of Hawai'i
Lakes from from GSHHG
Contours derived from 1-Minute Gridded Global Relief Data (ETOPO1), NOAA National Centers for Environmental Information, using gdal_contour (from GDAL).
Kanguole