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There are 540 rivers in Bulgaria. [1] The longest river in Bulgaria is the Danube (2,888 km), which spans most of the country's northern border for a length of 470 km. The longest one to run through the country (and also the deepest) is the Maritsa (480 km), while the longest river that runs solely in Bulgaria is the Iskar (368 km).
It can be thought of as a list of the biggest rivers on Earth, measured by a specific metric. For context, the volume of an Olympic-size swimming pool is 2,500 m 3 (88,000 cu ft). The average flow rate at the mouth of the Amazon is sufficient to fill more than 83 such pools each second.
As it emerges out of the valley the river fills the Iskar Reservoir, the largest artificial lake in Bulgaria. [13] [16] Downstream of the dam the Iskar flows in north-western direction and forms the 22 km long Pancharevo Gorge that divides the Vitosha and Plana Mountains in the west and the Sredna Gora mountain range in the east. [17]
The population growth rate estimates (according to the United Nations Population Prospects 2019) between 2015 and 2020 [6] The 20 countries in the world in which the population has declined between 2010 and 2015
The Ogosta river is 147.4 km in length and is fed by 40 tributaries (including the Skat River) in a watershed of 3,157 square kilometers. [2] The average water discharge in the lower course of the river is 18 cubic meters per second. Along the river's length there are 14 irrigation systems, 8 hydropower plants, and 13 dams.
Bulgaria's flora contains between 3,800 [87] and 4,200 [88] vascular plant species of which 170 are endemic and 150 are considered endangered. There more than 6,500 species of non-vascular plants and fungi. [84] The Eurasian lynx has a growing population in Bulgaria. Bulgaria's vertebrate fauna is among the most diverse in Europe.
Population density (people per km 2) by country. This is a list of countries and dependencies ranked by population density, sorted by inhabitants per square kilometre or square mile. The list includes sovereign states and self-governing dependent territories based upon the ISO standard ISO 3166-1.
1.49 children born/woman (2021 est.) Country comparison to the world:204th 1.47 children born/woman (2018 est.) Country comparison to the world: 201st Net migration rate-0.29 migrant(s)/1,000 population (2021 est.) Country compy to the world:115 Population growth rate-0.67% (2021 est.) Country comparison to the world: 229th