The pass takes its name from the Hua Hum River that flows from Argentina into Chile at the site of the border crossing.

The pass is used primarily for tourism as the Chilean 203-CH road is interrupted by Pirihueico Lake.

A ferry equipped to transport vehicles as well as people may be taken to Puerto Fuy, on the other side of Pirihueico Lake.

It is the main pass of the Chilean Los Ríos Region to Neuquén Province in Argentina.

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