Former distribution of Tocharian languages. The solid area denotes directly attested languages (Tocharian A and B), while the outline denotes loanword traces (Tocharian C).
Own work, using

Coastline, lakes and rivers from Natural Earth 1:50m Physical Vectors
Contours derived from 5-Minute Gridded Global Relief Data (ETOPO5), NOAA National Centers for Environmental Information, using gdal_contour (from GDAL).
Language areas from:
Mallory, J.P.; Mair, Victor H. (2000), The Tarim Mummies: Ancient China and the Mystery of the Earliest Peoples from the West, London: Thames &amp; Hudson, ISBN 978-0-500-05101-6, pp 67, 68, 274.
Mallory, J.P. (2010), "Bronze Age Languages of the Tarim Basin", Expedition 52 (3): 44–53.
Kanguole