It's 20m long and is made of 42 panels, each one produced by a different artist.
It's the Whanganui River Print, a woodcut representation of the Whanganui River on paper.
The project was organised by Graham Hall, a printmaker and art teacher at Whanganui High School.
"I came up with the idea as a way of acknowledging the community of printmaking artists in Whanganui. We always hear about glass artists, but there are many printmakers as well," Mr Hall said.
"I'm also hoping it will generate a lot of conversation about the river."