Oleška (river)

The Oleška is a river in the Czech Republic, a left tributary of the Jizera River. It flows through the Liberec and Hradec Králové regions. It is 36.0 km (22.4 mi) long.

Oleška
The Oleška in Košťálov
Location
Country	Czech Republic
Regions	Liberec Hradec Králové
Physical characteristics
Source
• location	Studenec, Giant Mountains Foothills
• coordinates	50°34′13″N 15°32′48″E
• elevation	538 m (1,765 ft)
Mouth
• location	Jizera
• coordinates	50°36′4″N 15°19′54″E
• elevation	316 m (1,037 ft)
Length	36.0 km (22.4 mi)
Basin size	171.3 km2 (66.1 sq mi)
Discharge
• average	1.74 m3/s (61 cu ft/s) near estuary
Basin features
Progression	Jizera→ Elbe→ North Sea

Etymology

The name is derived from the Czech word olše (i.e. 'alder'), meaning "water flowing between alders".^[1]

Characteristic

Confluence of the Oleška and Jizera

The Oleška originates in the territory of Studenec in the Giant Mountains Foothills at an elevation of 538 m (1,765 ft) and flows to Semily, where it enters the Jizera River at an elevation of 316 m (1,037 ft). It is 36.0 km (22.4 mi) long.^[2] Its drainage basin has an area of 171.3 km² (66.1 sq mi).^[3]

The longest tributaries of the Oleška are:^[2]

Tributary	Length (km)	Side
Popelka	13.1	left
Tampelačka	10.1	right
Rokytka	7.8	left

Course

The river flows through the municipal territories of Studenec, Levínská Olešnice, Stará Paka, Bělá, Libštát, Košťálov, Slaná and Semily.

Fauna

Fish species that live in the river include brown trout, rainbow trout, brook trout and grayling.^[4]

See also

• List of rivers of the Czech Republic