The International Tunnel is a tunnel between Rijon and Naljo.
Pokémon Brown
The International Tunnel can be accessed by Surfing on Route 58. A guard blocks the player from entering Naljo, but there are items and wild Pokémon in the tunnel. The ladder behind the guard leads to an empty room.
Pokémon Prism
If the player obtains the Rijon Pass, the tunnel can be used to travel between Rijon and Naljo. The Naljo entrance is on Route 70.
Rijon Adventures
The International Tunnel's Rijon entrance has been merged with the Rijon Tunnel, which connects Tan Boat Creek, Hayward City, and the Mt. Boulder Caves. The passage leading to Naljo has been destroyed.
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