fluminibus
fluminibus is a Latin form of flumen, meaning “river”. It is the dative plural neuter noun.
Found 60 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 4.1.10: Atque in eam se consuetudinem adduxerunt ut locis frigidissimis neque vestitus praeter pelles habeant quicquam, quarum propter exiguitatem magna est corporis pars aperta, et laventur in fluminibus.
Ammianus Marcellinus, Res Gestae 23.6.48: Post huius terminos gentis, Carmania maior verticibus celsis erigitur, ad usque Indicum pertinens mare, fructuariis arboreisque fetibus culta, sed obscurior Arabum terris multo et minor. Fluminibus tamen ipsa quoque non minus abundans, caespiteque ubere iuxta fecunda.
All forms of flumen (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.