Typically a relatively flat, valley marginal feature that is perched above the contemporary channel or floodplain. These erosional surfaces have a bedrock core, often with a thin alluvial overburden. Strath terraces often confine the channel, analogous to valley margins.
Reflect incision and valley expansion associated with downcutting into bedrock, abandoning terrace surfaces. In many cases, a contemporary floodplain subsequently develops and becomes inset within these terraces. In other cases, where incision occurs with little lateral expansion, a confined valley is formed.