This is the main entrance to the Snakes' underground lair. You really don't want to go down there.
The Snake Charmer Badge marker is located in a snake pit approximately 506 yards due west of the Darwin's Landing marker, and 536 yards Northwest of the Mercy Door in Mercy Island. It is in the Darwin's Landing neighborhood.
Its coordinates are (-385, 42, -1,712).
Gladiator Badge Unlocked
When you obtain this badge, you will unlock the Cobra gladiator badge.