Zaban City (ザバン市, Zaban-shi) was the preliminary site of the 287th Hunter Exam. Described as a prosperous city, the streets are subsequently filled with shady dealers and scam artists. The city is known for being home to Johness the Dissector, a serial killer who maimed 146 victims with his bare hands.
A large tunnel was built 100 stories underneath Zaban City and can only be accessed through a secret entrance located in the Tsubashi Street (ツバシ町, Tsubashi-chō—lit. Tsubashi District). It leads directly to the Milsy Wetlands. The passage is more than 80 kilometers long. It is mostly flat, but more than halfway through it goes into a series of stairs. Pipes line the ceiling of the tunnel.
In the 1999 anime series, the underground tunnel has several forks that lead to shortcuts. However, the shortcuts are lined with a hallucinogenic cedar with a special smell. Tonpa takes Leorio and Nicholas to that tunnel in order to ruin their chances of passing the exam.