• Started with the Britannica Online, searched for Tana-Tuva
• Found:
  

     Tuva, also called Tyva, or Tannu-Tuva,
     republic in south-central Siberia, Russia.
     Tuva borders northwestern Mongolia and
     occupies the basin of the upper Yenisey
     River. ... Pop. (1992 est.) 306,000.
  

• If you are interested in Tuva you will be pleased to explore the Friends of Tuva on the World Wide Web site. There is an interesting connection to Richard Feynman, the late physicist, but maybe you already knew this and were trying to amuse me... Anyways, they list the population as 308,000 (about 64 percent Tuvan and about 32 percent Russian) in their FAQ.
• Ans: ~300,000

"http://www.physics.udel.edu/~watson/tlt3/challenge5.html"
Last updated June 2, 1998.
Copyright George Watson, Univ. of Delaware, 1998.