The gerund in the sentence is "traveling," and it functions as a noun and the subject in the sentence.
A gerund simply refers to a verb that ends in -ing. It should be noted that the gerund functions as a noun. In this case, the gerund will be "traveling" and it performs the function of a noun.
It also performs as the subject in the sentence that's given. In conclusion, the gerund in the question is "traveling".
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