Medium-sized Acrocephalus warbler with cold gray-olive-brown plumage and whitish underparts. Note the long and slender bill and the short eyebrow that reaches just behind eye. Distinctly larger that Eurasian Reed Warbler and smaller than Great Reed Warbler. Breed in extensive reedbeds. Call a harsh "charr." Song is rather quiet and slow mixed with deep, bulbul-like notes.