Psou

It flows along the southern slopes of the Greater Caucasus Mountain Range and forms a part of the border between Georgia (Abkhazia) and Russia. Its source in the Aigra Mountain, and it flows into the Black Sea. The Psou is 53 kilometres (33 mi) long, and the drainage basin is approximately 421 square kilometres (163 sq mi). Between the mouth of the river and the mouth of the Mzymta is a "sandy depositional foreland", which is approximately 8 kilometres (5.0 mi) in length and 2 kilometres (1.2 mi) wide.

Psou
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Location
Country	Georgia (Abkhazia), Russia
Physical characteristics
Source
• location	Greater Caucasus
Mouth
• location	Black Sea
• coordinates	43°23′10″N 40°00′36″E / 43.3861°N 40.0101°E / 43.3861; 40.0101
Length	53 km (33 mi)
Basin size	421 km2 (163 sq mi)

The principal tributaries of the Psou are the Besh and the Pkhista. Between 1913 and 1955 there was a hydrological station in operation at Leselidze, roughly 1.5 kilometres (0.93 mi) upstream of the river mouth. The Psou gained notoriety as a smuggling route out of the country, by-passing Russian controls on the border. As of 2008 it was still designated as a transboundary river which lacked an international cooperation agreement as part of the UNECE Water Convention.