alaska
background
closeup
concept
conditions
conservation
danger
danger sign
dangerous
device
digitally generated image
environmental protection
equipment
falling rocks
focus on foreground
fragile sign
hazard
hazardous
health
hiking trail sign
icon
information
landscape
management
mountain bridge
national parks
nature
outdoor
parks recreation
pictures
placards
plants
protection
public
safety
seedlings
snow capped mountains
symbol
tourism
tourists
travel destinations
uneven surface
united states of america
usa
warning
wilderness landscape
yellow sign