In 2006, a National Geographic expedition returned to the head of the Iso River to explore the Ora doline and the Phantom Pot cave system. Aerial surveys have also identified massive "resurgences"—points where underground rivers emerge—issuing from the western cliffs of the Iso River. Common Confusions
The Iso River is known for its role in localized flooding. During periods of heavy rainfall, the rising water levels of the Ida River can prevent the Iso River from draining properly, leading to "inundation floods" that affect both agricultural lands and residential areas. iso river
Not everyone is celebrating. Critics argue that applying industrial standards to a river is a category error. In 2006, a National Geographic expedition returned to