(1) What is "waterboarding" in interrogation? (2) What is "backwood"? (Sorry, there is no context for this word.)
Waterboarding is a way of simulating drowning by pouring water over someone's face when they are lying on an inclined board. Here's a painting of the Khmer Rouge using it that is in a museum in Phnom Penh :
A backwood is a rural area, often associated with being out of touch with modern life.