- Ithe Wolga, on whose banks grew the radix pontica, Rha ponticum, rhubarb (Rheum Rhaponticum, Linn.), which thence received its name, Amm. 22, 8, 28 (cf. Cels. 5, 23 fin.).
Rha, m. , ind. (Ῥᾶ) le Rha [grand fleuve de la Sarmatie, qui se jette dans la mer Caspienne, auj. la Volga] : Amm. 22, 8, 28.
RHA (Ῥᾶ ποταμός, Ptol. 5.9. §§ 12, 17, 19, 21, 6.14. §§ 1, 4; Ammian. 22.8.28; Ῥῶς, Agathem. 2.10: Volga) a river of Asiatic Sarmatia, which according to Ptolemy (l. c.), the earliest geographer who had any accurate knowledge of this longest of European streams, had its twin sources in the E. and W. extremities of the Hyperborean mountains, and discharged itself into the Hyrcanian sea. The affluents which Ptolemy (Ptol. 6.14.4) describes as falling into it from the Rhymmici Montes, and which must not be confounded with the river Rhymmus [RHYMMUS], are the great accession made to the waters of the Volgaby the Kamain the government of Kasan.Ammianus Marcellinus (l. c.) says that its banks were covered with the plant which bore the same name as the river--the rhaor rheonof Dioscorides (ῥᾶ, ῥῆον,3.11) and rhacomaof Pliny (Plin. Nat. 27.105), or officinal rhubarb. (Comp. Pereira, Mat. Med.vol. ii. pt. 1. p. 1343.) The old reading Rha in the text of Pomponius Mela (3.5.4) has been shown by Tzschucke (ad loc.) to be a mistake of the earlier editors, for which he substitutes Casius, a river of Albania. The OARUS(Ὄαρος,Hdt. 4.123, 124), where, according to the story of the Scythian expedition, the erection of eight fortresses was supposed to mark the extreme point of the march of Dareius, has been identified by Klaproth, and Schafarik (Slav. Alt.vol. 1. p. 499)--who mentions that in the language of some tribes the Volgais still called Rhau--with that river.
(Ῥά). Now the Volga; a great river of Asia, first mentioned by Ptolemy, who describes it as rising in the north of Sarmatia, in two branches, Rha Occidentalis and Rha Orientalis (the Volga and the Kama), after the junction of which it flowed southwest, forming the boundary between Sarmatia Asiatica and Scythia, till near the Tanaïs (Don), where it suddenly turns to the southeast, and falls into the northwestern part of the Caspian ( Ptol.v. 9; vi. 14).