According to Captain Carbajal, who descended the Pongo de Manseriche in the little steamer " Napo ," in 1868, it is a vast rent in the Andes about 600 m ( 2000 ft ) deep, narrowing in places to a width of only 30 m ( 100 ft ), the precipices " seeming to close in at the top.

According to Captain Carbajal, who descended the Pongo in the little steamer Napo, in 1868, it is a vast rent in the Andes about 2000 ft ( 600 m ) deep, narrowing in places to a width of only 100 ft ( 30 m ), the precipices " seeming to close in at the top.

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