Issa (Velikaya)
Issa Исса |
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The Issa in Opochka district |
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Data | ||
Water code | RU : 01030000112102000027925 | |
location | Pskov Oblast ( Russia ) | |
River system | Narva | |
Drain over | Velikaya → Narva → Baltic Sea | |
origin | See Dedino 56 ° 15 '2 " N , 28 ° 14' 49" O |
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Source height | 119 m | |
muzzle |
Velikaya coordinates: 56 ° 58 '10 " N , 28 ° 47' 33" E 56 ° 58 '10 " N , 28 ° 47' 33" E |
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Mouth height | 65 m | |
Height difference | 54 m | |
Bottom slope | 0.31 ‰ | |
length | 174 km | |
Catchment area | 1580 km² | |
Course of the Issa (Исса) in the catchment area of the Narva |
The Issa ( Russian Исса ) is a left tributary of the Velikaja in the Russian Oblast of Pskov .
The Issa has its origin in the small lake Dedino in the extreme southwest of the Pskov Oblast. From there it flows in a predominantly north-northeast direction until it finally meets the Velikaya flowing north, 178 km above its confluence with Lake Peipus .
The Issa has a length of 174 km. It drains an area of 1580 km². There are 200 smaller lakes in the catchment area of the Issa. The snowmelt accounts for a significant proportion of the annual runoff of the Issa.