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Oboka? (river) — by A.S. Esmonde Cleary — last modified Oct 27, 2022 08:43 AM

The modern River Liffey flows from Liffey Head Bog to the Irish Sea.

Ocharius (river) — by David Braund — last modified May 16, 2024 10:29 AM

An ancient place, cited: BAtlas 84 unlocated Ocharius fl.

Ocherainos/Ochosbanes/Ochthomanes (river) — by C. Foss — last modified Oct 27, 2017 05:20 PM

An ancient place, cited: BAtlas 86 F2 Ocherainos/Ochosbanes/Ochthomanes fl.

Ochos? (river) — by St J. Simpson — last modified Aug 16, 2021 10:24 AM

An ancient place, cited: BAtlas 98 E2 Ochos? fl.

Odryses (river) — by C. Foss — last modified Jan 13, 2020 09:53 AM

Odryses fl. (Nilufer or Niloufer River (Turkish: Nilüfer Çayı)).

Oeroe (river) — by J. Fossey — last modified Sep 25, 2023 05:21 PM

The modern Livadostras river, emptying into the Corinthian Gulf near ancient Kreusis.

Oescus (river) — by A.G. Poulter — last modified Mar 17, 2023 01:31 PM

The Oescus river (modern Iskar) is a river of Bulgaria and tributary of the Danube.

Ollius (river) — by M. Pearce — last modified Jun 03, 2021 05:13 PM

An ancient place, cited: BAtlas 39 F2 Ollius fl.

Olonna (river) — by M. Pearce — last modified Feb 19, 2018 05:24 PM

The Olona river flows through the provinces of Varese, Milan and Pavia and empties into the Lambro meridionale.

Omma (river) — by T.B. Mitford — last modified Oct 27, 2017 05:11 PM

An ancient place, cited: BAtlas 64 H4 Omma fl.

Ophis (river) — by T. Sinclair — last modified Feb 21, 2023 08:54 AM

An ancient place, cited: BAtlas 87 F4 Ophis fl.

Ophis (river) — by G. Reger — last modified Feb 24, 2016 11:22 PM

An ancient place, cited: BAtlas 58 C2 Ophis fl.

Ophradus (river) — by M.U. Erdosy — last modified Aug 15, 2021 04:58 PM

An ancient place, cited: BAtlas 6 unlocated Ophradus fl.

Or(o)bis (river) — by S. Loseby — last modified Aug 30, 2018 05:21 PM

An ancient place, cited: BAtlas 15 A3 Or(o)bis fl.

Orgas (river) — by C. Foss — last modified Oct 27, 2017 05:11 PM

An ancient place, cited: BAtlas 65 D1 Orgas fl.

Orgus (river) — by M. Pearce — last modified Oct 27, 2017 04:24 PM

Orgus fl. (Orco river) is a river of northern Italy and a tributary of the Padus fl. (Po river).

Ornia (river) — by E.W. Haley — last modified Oct 21, 2022 08:09 PM

An ancient place, cited: BAtlas 24 E2 Ornia fl.

Orontes (river) — by T. Sinclair — last modified Oct 05, 2023 04:21 PM

The Orontes River is one of the chief rivers of the Levant.

Orymagdos (river) — by S. Mitchell — last modified Oct 27, 2017 05:12 PM

An ancient place, cited: BAtlas 66 B4 Orymagdos fl.

Ostium Caprasiae — by M. Pearce — last modified Jan 18, 2024 12:07 AM

Ostium Caprasiae, one of the mouths of the Po river.