If you like dirt roads try some of following:
Peru: to Chachapoyas and there around all the roads are gravel - more or less, some are sandy; also good is the spectecular Cordillera Blanca and Cord. Negra.
Argentina/Chile: all the passes are unpaved eccept Mendoza-Santiago (very beautiful!) and soon Villa La Angostura-Osorno; try Paso de Jama from San Pedro de Atacama in Chile to Salta - you will have many endless gravel and sandwholes on the argentinian side; Ruta 40 is all gravel behind Rio Mayo down south but strong winds - we had to return before reaching Tres Lagos; Camino Austral on the South of Chile is beautiful and in good gravel shape; We just did that all.
Bolivia and all the Great Salt Lake supposed to have only gravel and dirt and - of course - salt. Enjoy!
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