Mark Twang is John Hartford's 1976 album of river songs and other eccentric gems, which came from inspiration from years of working on a riverboat. The album was recorded all acoustic in the studio with Hartford by himself on all instruments and vocals.
Writing for Allmusic, critic Ronnie D. Lankford, Jr. wrote of the album "The songs, as usual, run from sentimental to strange, from the romantic to the weird... Mark Twang may not be the first stopping place for the new Hartford fan, but for those already familiar with his unique talent, it's a must have." Music critic Robert Christgau wrote "These days he sings mostly about the mighty Mississip (too thick to navigate, too thin to plow) and records eccentric river music for a folk label. He's slightly the better for it, on the whole—but I wouldn't say his living sounds so secure that he should turn down a gig on the Proud Mary. A gig playing, or a gig navigating"