It breeds in temperate Asia and easternmost Europe. It is migratory, wintering in India and Sri Lanka. It is one of the most common winter warblers in those countries. It is a rare vagrant to western Europe. This is a medium-sized warbler, 12.5-14 cm in length. The adult has a plain brown back and pale underparts. Like most warblers, Blyth's reed warbler is insectivorous, but will take other small food items, including berries.