You can hear the water before you reach the bottom of the slope, echoing off the high walls of what is no longer "slope," but is in fact a canyon.
(You; can hear; the water; T:before you reach the bottom of the slope, echoing off the high walls of what is no longer "slope) (you; reach; the bottom of the slope) Context(you reach,List([30, 39))):(you; reach the bottom of the slope echoing off; the high walls of what is no longer "slope)
you reach,List([30, 39))
You you you
can hear reach reach the bottom of the slope echoing off
the water T:before you reach the bottom of the slope, echoing off the high walls of what is no longer "slope
the bottom of the slope
the high walls of what is no longer "slope