Assertion: pit viper | /r/AtLocation | northwest china
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: According to a study by Shaanxi Normal University graduate students in 2007, the Central Asian pit viper is "the most toxic pit-viper species usually seen in northwest China and part of north China, and it is responsible for the most snakebite accidents in these area[s].