The Rioni or Rion River ( Rioni, Phasis) is the main river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 of western Georgia

Georgia (country)

Georgia is a sovereign state in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded to the west by the Black Sea, to the north by Russia, to the southwest by Turkey, to the south by Armenia, and to the southeast by Azerbaijan. The capital of...

. It originates in the Caucasus Mountains

Caucasus Mountains

The Caucasus Mountains is a mountain system in Eurasia between the Black Sea and the Caspian Sea in the Caucasus region .The Caucasus Mountains includes:* the Greater Caucasus Mountain Range and* the Lesser Caucasus Mountains....

, in the region of Racha

Racha

Racha is a highland area in western Georgia, located in the upper Rioni river valley and hemmed in by the Greater Caucasus mountains...

 and flows west to the Black Sea

Black Sea

The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

, entering it north of the city of Poti

Poti

Poti is a port city in Georgia, located on the eastern Black Sea coast in the region of Samegrelo-Zemo Svaneti in the west of the country. Built near the site of the ancient Greek colony of Phasis, the city has become a major port city and industrial center since the early 20th century. It is also...

 (near ancient Phasis

Phasis (town)

Phasis was an ancient and early medieval city on the eastern Black Sea coast, founded in the 7th/6th century BC as a colony of the Milesian Greeks at the mouth of the eponymous river in Colchis, near the modern-day port city of Poti, Georgia.-Etymology:...

). The city of Kutaisi

Kutaisi

Kutaisi is Georgia's second largest city and the capital of the western region of Imereti. It is 221 km to the west of Tbilisi.-Geography:...

, once ancient city of Colchis

Colchis

In ancient geography, Colchis or Kolkhis was an ancient Georgian state kingdom and region in Western Georgia, which played an important role in the ethnic and cultural formation of the Georgian nation.The Kingdom of Colchis contributed significantly to the development of medieval Georgian...

, lies on its banks.

History

Known to the ancient Greeks

Ancient Greece

Ancient Greece is a civilization belonging to a period of Greek history that lasted from the Archaic period of the 8th to 6th centuries BC to the end of antiquity. Immediately following this period was the beginning of the Early Middle Ages and the Byzantine era. Included in Ancient Greece is the...

 as the Phasis River, Rioni was first mentioned by Hesiod

Hesiod

Hesiod was a Greek oral poet generally thought by scholars to have been active between 750 and 650 BC, around the same time as Homer. His is the first European poetry in which the poet regards himself as a topic, an individual with a distinctive role to play. Ancient authors credited him and...

 in his Theogony (l.340); later writers like Apollonius Rhodius (Argonautica 2.12.61), Virgil

Virgil

Publius Vergilius Maro, usually called Virgil or Vergil in English , was an ancient Roman poet of the Augustan period. He is known for three major works of Latin literature, the Eclogues , the Georgics, and the epic Aeneid...

 (Georgics 4.367) and Aelius Aristides

Aelius Aristides

Aelius Aristides was a popular Greek orator , who lived during the Roman Empire. He is considered to be a prime example of the Second Sophistic, a group of showpiece orators who flourished from the reign of Nero until ca. 230 AD. His surname was Theodorus...

 (Ad Romam 82) considered it the easternmost limit of the navigable seas. Socrates, in Phaedo referred to the portion of the world he knew of as between the Pillars of Hercules

Pillars of Hercules

The Pillars of Hercules was the phrase that was applied in Antiquity to the promontories that flank the entrance to the Strait of Gibraltar. The northern Pillar is the Rock of Gibraltar in the British overseas territory of Gibraltar...

 and the River Phasis, while Herodotus

Herodotus

Herodotus was an ancient Greek historian who was born in Halicarnassus, Caria and lived in the 5th century BC . He has been called the "Father of History", and was the first historian known to collect his materials systematically, test their accuracy to a certain extent and arrange them in a...

 considered Rioni as a boundary between Europe and Asia

The term "pheasant

Pheasant

Pheasants refer to some members of the Phasianinae subfamily of Phasianidae in the order Galliformes.Pheasants are characterised by strong sexual dimorphism, males being highly ornate with bright colours and adornments such as wattles and long tails. Males are usually larger than females and have...

" and the scientific name Phasianus colchicus are derived from "Phasis" and "Colchis", as this was said to be the region from which the Common Pheasant was introduced to Europe in ancient times (the ring-necked pheasants seen in the present day were later introduced from East Asia

East Asia

East Asia or Eastern Asia is a subregion of Asia that can be defined in either geographical or cultural terms...

; see Common Pheasant

Common Pheasant

The Common Pheasant , is a bird in the pheasant family . It is native to Georgia and has been widely introduced elsewhere as a game bird. In parts of its range, namely in places where none of its relatives occur such as in Europe , it is simply known as the "pheasant"...

 for details).

River Description

Rioni is the longest river wholly within the borders of Georgia

Georgia (country)

Georgia is a sovereign state in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded to the west by the Black Sea, to the north by Russia, to the southwest by Turkey, to the south by Armenia, and to the southeast by Azerbaijan. The capital of...

. Length of the river is 327 km and the area around 13400 km². It starts on the southern slopes of the Caucasus Mountains at 2960 meters above the Sea level

Sea level

Mean sea level is a measure of the average height of the ocean's surface ; used as a standard in reckoning land elevation...

.