This document provides an overview of rivers and drainage basins. It defines a river, describes the water cycle and precipitation that feeds rivers. It explains the four types of river origins and stages of river development. Key river characteristics like width, depth, velocity and discharge are outlined. The hydrological cycle and its major components are described. Drainage basins are defined as the catchment area that feeds a river system, and key basin features like the source, mouth, tributaries and confluence are identified. Four characteristics of drainage basins are described: drainage patterns, drainage density, stream ordering, and vegetation and climatic hydrologic factors.