It looks like you provided Greek: «Πέτρινο ποτάμι» which translates to Persian as «رودِ سنگی» or more naturally «رودخانه سنگی» depending on context. If this is a title, a direct transliteration could be «رودخانهٔ سنگی». If you want a faithful translation preserving a poetic tone: «رودخانهٔ سنگی».
