The Kotmale River is a significant waterway located in the central region of Sri Lanka. It is a tributary of the Mahaweli River, which is the longest river in the country. The Kotmale River flows through lush green landscapes, providing vital water resources for agriculture and supporting local ecosystems. The river is also known for the Kotmale Reservoir, created by the construction of the Kotmale Dam. This reservoir plays a crucial role in hydroelectric power generation, contributing to the energy needs of the region. The surrounding area is popular for its scenic beauty and opportunities for outdoor activities.