Which class of river would a novice be least successful in navigating?

A novice would be least successful in navigating a Class VI river. Class VI rivers are characterized by extremely difficult and hazardous conditions that are generally suitable only for expert paddlers with extensive experience and specialized skills. These rivers often contain severe obstacles, unpredictable rapids, and other challenging features that can present life-threatening risks.

Due to these characteristics, those with less experience, such as novices, would have a significantly higher chance of encountering danger and being unable to effectively respond to emergencies or navigate through the challenges presented by a Class VI river. In contrast, lower classes like Class II and III represent milder conditions better suited for paddlers with minimal experience, allowing for skills to be developed in safer environments.