Stuðlagil is a ravine in the Eastern Region of Iceland. It is known for its columnar basalt rock formations and the blue-green water that runs through it. It became an unexpected tourist sensation after being shown in a WOW air airline brochure in 2017. The rock formation is 30 meters tall.
The river Jökla runs through the ravine. The water level decreased by 7 to 8 meters due to the Kárahnjúkar Hydropower Plant, which opened in 2009.