It flows from the west of Peasenhall through Sibton and Yoxford where it becomes the Minsmere River.
[1] The Yox was originally fordable at Yoxford where a modern road bridge allows the A12 to cross the river.
The valley has a narrow floodplain with water meadows and has largely been drained using a system of dykes.
[2][3] As of 2018, the river at Yoxford was seen to contain sticklebacks, brown trout, frogs, newts, grass snakes, and otters.
As of 2020, water voles and kingfishers have been regularly seen on a stretch of the river behind Yoxford High Street.