In breeding range, this large, long-billed songster of expansive reedbeds can often be seen perched on top of a stalk belting its heart out, but on wintering grounds, it is more likely to be detected by a harsh, grating rattling from deep within the vegetation. Unremarkably plumaged, brown above, paler below, with a weak white supercilium and a short bristly crest, occasionally raised. Compare with other large reed warblers, especially Clamorous Reed Warbler.