Kahalgaon Island is a river island formed in the Ganga River near Kahalgaon town in the Bhagalpur district of Bihar. It is part of the riverine diara region, created by continuous deposition of fertile alluvial soil. The island is mainly used for seasonal agriculture, with crops like maize, wheat, vegetables, and pulses grown by local farmers. Life on the island is closely connected to the river, and access is usually by boats during most seasons. The island landscape changes with the flow and flooding patterns of the Ganga. It supports a simple rural lifestyle with temporary settlements in some areas. The surrounding river environment also attracts birds and aquatic life. Kahalgaon Island reflects the dynamic natural geography of the Ganga plains.