Blueburn

Blueburn is a river in Game of Thrones. It lies in the Reach, the region of Westeros under the control of House Tyrell of Highgarden. It is a tributary of the Mander. It flows west from headlands near the border with the Stormlands into the Mander near Long Table. It runs past Grassy Vale.

In the books
In the Song of Ice and Fire novels Blueburn is the same.