Georgia

Relief, drainage, and soils

With the notable exception of the fertile plain of the Kolkhida Lowland—ancient Colchis, where the legendary Argonauts sought the Golden Fleece—the Georgian terrain is largely mountainous, and more than a third is covered by forest or brushwood. There is a remarkable variety of landscape, ranging from the subtropical Black Sea shores to the ice and snow of the crest line of the Caucasus. Such contrasts are made more noteworthy by the country’s relatively small area.

Britannica Quiz

The Country Quiz

The rugged Georgia terrain may be divided into three bands, all running from east to west.

To the north lies the wall of the Greater Caucasus range, consisting of a series of parallel and transverse mountain belts rising eastward and often separated by deep, wild gorges. Spectacular crest-line peaks include those of Mount Shkhara, which at 16,627 feet (5,068 metres) is the highest point in Georgia, and Mounts Rustaveli, Tetnuld, and Ushba, all of which are above 15,000 feet. The cone of the extinct Mkinvari (Kazbek) volcano dominates the northernmost Bokovoy range from a height of 16,512 feet. A number of important spurs extend in a southward direction from the central range, including those of the Lomis and Kartli (Kartalinian) ranges at right angles to the general Caucasian trend. From the ice-clad flanks of these desolately beautiful high regions flow many streams and rivers.

The southern slopes of the Greater Caucasus merge into a second band, consisting of central lowlands formed on a great structural depression. The Kolkhida Lowland, near the shores of the Black Sea, is covered by a thick layer of river-borne deposits accumulated over thousands of years. Rushing down from the Greater Caucasus, the major rivers of western Georgia, the Inguri, Rioni, and Kodori, flow over a broad area to the sea. The Kolkhida Lowland was formerly an almost continually stagnant swamp. In a great development program, drainage canals and embankments along the rivers were constructed and afforestation plans introduced; the region has become of prime importance through the cultivation of subtropical and other commercial crops.

To the east the structural trough is crossed by the Meskhet and Likh ranges, linking the Greater and Lesser Caucasus and marking the watershed between the basins of the Black and Caspian seas. In central Georgia, between the cities of Khashuri and Mtsʿkhetʿa (the ancient capital), lies the inner high plateau known as the Kartli (Kartalinian) Plain. Surrounded by mountains to the north, south, east, and west and covered for the most part by deposits of the loess type, this plateau extends along the Kura (Mtkvari) River and its tributaries.

The southern band of Georgian territory is marked by the ranges and plateaus of the Lesser Caucasus, which rise beyond a narrow, swampy coastal plain to reach 10,830 feet in the peak of Didi-Abuli.

A variety of soils are found in Georgia, ranging from gray-brown and saline semidesert types to richer red earths and podzols. Artificial improvements add to the diversity.

Climate

The Caucasian barrier protects Georgia from cold air intrusions from the north, while the country is open to the constant influence of warm, moist air from the Black Sea. Western Georgia has a humid subtropical, maritime climate, while eastern Georgia has a range of climate varying from moderately humid to a dry subtropical type.

There also are marked elevation zones. The Kolkhida Lowland, for example, has a subtropical character up to about 1,600 to 2,000 feet, with a zone of moist, moderately warm climate lying just above; still higher is a belt of cold, wet winters and cool summers. Above about 6,600 to 7,200 feet there is an alpine climatic zone, lacking any true summer; above 11,200 to 11,500 feet snow and ice are present year-round. In eastern Georgia, farther inland, temperatures are lower than in the western portions at the same altitude.

Western Georgia has heavy rainfall throughout the year, totaling 40 to 100 inches (1,000 to 2,500 mm) and reaching a maximum in autumn and winter. Southern Kolkhida receives the most rain, and humidity decreases to the north and east. Winter in this region is mild and warm; in regions below about 2,000 to 2,300 feet, the mean January temperature never falls below 32 °F (0 °C), and relatively warm, sunny winter weather persists in the coastal regions, where temperatures average about 41 °F (5 °C). Summer temperatures average about 71 °F (22 °C).

In eastern Georgia, precipitation decreases with distance from the sea, reaching 16 to 28 inches in the plains and foothills but increasing to double this amount in the mountains. The southeastern regions are the driest areas, and winter is the driest season; the rainfall maximum occurs at the end of spring. The highest lowland temperatures occur in July (about 77 °F [25 °C]), while average January temperatures over most of the region range from 32 to 37 °F (0 to 3 °C).

Plant and animal life

Georgia’s location and its diverse terrain have given rise to a remarkable variety of landscapes. The luxuriant vegetation of the moist, subtropical Black Sea shores is relatively close to the eternal snows of the mountain peaks. Deep gorges and swift rivers give way to dry steppes, and the green of alpine meadows alternates with the darker hues of forested valleys.

More than a third of the country is covered by forests and brush. In the west a relatively constant climate over a long time span has preserved many relict and rare items, including the Pitsunda pines (Pinus pithyusa). The forests include oak, chestnut, beech, and alder, as well as Caucasian fir, ash, linden, and apple and pear trees. The western underbrush is dominated by evergreens (including rhododendrons and holly) and such deciduous shrubs as Caucasian bilberry and nut trees. Liana strands entwine some of the western forests. Citrus groves are found throughout the republic, and long rows of eucalyptus trees line the country roads.

Eastern Georgia has fewer forests, and the steppes are dotted with thickets of prickly underbrush, as well as a blanket of feather and beard grass. Herbaceous subalpine and alpine vegetation occurs extensively in the highest regions. Animal life is very diverse. Goats and Caucasian antelope inhabit the high mountains; rodents live in the high meadows; and a rich birdlife includes the mountain turkey, the Caucasian black grouse, and the mountain and bearded eagles. The clear rivers and mountain lakes are full of trout.

Forest regions are characterized by wild boars, roe and Caucasian deer, brown bears, lynx, wolves, foxes, jackals, hares, and squirrels. Birds range from the thrush to the black vulture and hawk. Some of these animals and birds also frequent the lowland regions, which are the home of the introduced raccoon, mink, and nutria. The lowland rivers and the Black Sea itself are rich in fish.