Small, shy, and poorly understood, this reed warbler breeds in the remote marshlands of northeastern China and Russia and winters in drier, grassier habitats in Southeast Asia. Warm brown overall with a clean-cut whitish brow and throat; brow extends well behind the eye, unlike in Blunt-winged Warbler. Very similar to extralimital Paddyfield Warbler, but Paddyfield shows dark-tipped lower mandible, duller brown tones overall, and a dirtier brow stripe with a distinctive pinch just before the eye, after which it fades out; Manchurian’s brow broadens behind the eye instead. Oriental Reed Warbler much larger, with a weaker head pattern. Rambling jumbled song consists of high-pitched warbling notes and sharp clicks and rattles; more pleasant-sounding than that of Oriental Reed Warbler.