Rondout (pronounced "ron doubt"), is situated on the Hudson River, at the mouth of Rondout Creek. Originally a maritime village serving the nearby city of Kingston, New York, Rondout merged with Kingston in 1872. It now includes the Rondout-West Strand Historic District.

https://en.wikipedia.org/wiki/Rondout,_New_York

Mark Twain would have needed to cross the Hudson River on a ferry boat to reach Rondout>