Hinni canyon is a unique canyon valley in Estonia, located in a specially managed zone in the Haanja Nature Park.

Hinni canyon was carved into sandstone during the Devonian period (420-359 million years ago). It is a 15–20 m deep, 300 m long, steep gulch with the rapidly flowing Enni creek cutting into its sandstone bottom. 

Intertwined layers of 5–6 m high white and yellow sandstone outcrops are exposed along the steep sides of nearly 200 m of the gulch. 

The object is not lighted, which is why it is recommended to visit the canyon during the daytime.