Blind Leading The Blind (Episode 4, "What's The Beef?")
When setting this challenge up in Cambodia, the crew came upon a river entrance location called Pagoda River Mouth, which was a dead ringer for the Panama location. That made this an ideal spot with enough space for the castaways to carry the bulky, 25-pound puzzle pieces. To avoid the players from running into rocks, rope barriers were placed throughout the course as a protective measure.
See how the challenge played out in this snippet from Episode 4.