ɪts mˈoʊst sɪɡnˈɪfɪkənt tɹˈɪbjuːtˌɛɹi ɪz ðə wˈɛst bɹˈæntʃ ʌvðə pˈiːbɑːdi ɹˈɪvɚ, ɪmˈɜːdʒɪŋ fɹʌm ɡɹˈeɪt ɡˈʌlf, ɐ dˈiːp ænd lˈɔŋ ɡlˈeɪʃəl sˈɜːk sɚɹˈaʊndᵻd baɪ ðə pˈiːks ʌvðə pɹˌɛzɪdˈɛnʃəl ɹˈeɪndʒ.
Its most significant tributary is the West Branch of the Peabody River, emerging from Great Gulf, a deep and long glacial cirque surrounded by the peaks of the Presidential Range.