A rare circular weir on the River Otter at the edge of the town, where the river spills over a perfectly round lip in a sheet of water that falls evenly on all sides. The Tumbling Weir is an industrial monument — it was built in 1790 to regulate water flow to the town's mill leat — but it is also one of the more unexpectedly beautiful small structures in Devon. The circular form is visually striking, and the sound of the water falling over it is audible from some distance.
Access is by a short footpath from the town centre. The river below the weir is good for swimming in summer; local children use the pool created by the weir as a natural swimming hole. The weir is listed as a Scheduled Ancient Monument. It is the kind of thing that would be a significant attraction in most English towns and is almost entirely unknown outside Ottery.