Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Podkamennaya Tunguska River - The Podkamennaya Tunguska (Russian: literally Tunguska under the stones also Middle Tunguska or Stony Tunguska) is a river in Krasnoyarsk Krai Russia. It is an eastern tributary of the Yenisei and has a length of 1160 miles (1870 km). The name of the river comes from the fact that it flows under pebble fields without open water.
The answer to this question is:
Natural Place