Fig. 1From: The effects of ENSO, climate change and human activities on the water level of Lake Toba, Indonesia: a critical literature reviewWatershed area of Lake Toba is part of the Toba Asahan River basin in North Sumatra Province, Indonesia, within the Barisan Hills that stretch from the north to south on the northern part of Sumatra Island. Observation of the Lake Toba water level for this study was carried out at Janji Matogu, Toba Samosir Regency (indicated by the blue circle)Back to article page