This document provides information on several rivers in Bulgaria. It describes the source, length, and other key details about rivers including the Danube, Iskar, Osam, Wit, Yantra, Ropotamo, Kamchia, Maritsa, Tundzha, Arda, Struma, and Mesta. The document also includes diagrams of river catchment areas and images related to some of the rivers.

1. Water
priceless treasure
BIOLOGICAL
PORTFOLIO

2. Structure of the water
molecule.
• Water molecule:
• Two hydrogen and one oxygen atom

3. Properties of water
• Dipole character of
water molecules
and the hydrogen
bonds that form
between them,
determine the
biological
importance of water
for living
organisms.

5. Leva River
• Leva is a river in
northwestern of
Bulgaria. Springs
from Vratsa
Mountain and
continue to the
bottom of the
mountain. The river
passes through the
city Vratsa and
flows into the
Ogosta river.

6. Iskar River is located
in western Bulgaria. It
springs from the Rila
Mountains and is the
longest river in the
country - 368
kilometers.

7. Catchment area of river
Iskar

8. It rises in the
Shvartsvald in Germany
and flows into the Black
Sea. We are bound by
many countries in
Europe.
It shall carry out the
links on our
country with the
countries of Western
and Central Europe.

9. Danube region Black Sea
Region

11. The river sore the main of the
water resources in Bulgaria .
Relatively small area the
country's proximity to the Black
Sea and the Aegean, and the
complex of geological and
geomorphologic features are the
reason our country rivers are
short and with small average
runoff .

13. Osam river is 314 km long
and its catchment area is
2,820 km ². It springs from
the foot of Levski peak a
part of the Balkan
Mountains at an altitude of
1,821 m ,length of the river
is 314 km to 2824 km
catchment area.
Osam formed by the merger
of the Black Osam River,
conditionally accepted for
its home, and White Osam.
It flows into the Danube
near the town of Nikopol.

14. Wit was formed by
the merger of White
and Black Wit. Wit
river springs from
the foot of peak
Vejen (Balkan
Mountains) at an
altitude 2030 m .It is
189 km long.

15. Yantra is a river in
northern Bulgaria. It
springs from the
Balkan Mountains and
flows into the
Danube. Its 285 km
long and is the third
largest among the
Bulgarian Danube
tributaries.

17. Ropotamo springs from the
northeastern foot of the
Strandja Mountain.It
passes through the
northeast Bulgaria after
leaving Strandja and
continues its way through
the narrow gorge between
the Copper Ridge and
Uzundzhata hill and goes
into wide marshy valley to
its mouth in the Black Sea.
The length of the river is
48.5 km.

18. River in northeastern
Bulgaria, part of the Black Sea
drainage area. Formed by the
merger of two tributaries:
Kamchia and great Kamchia
who originate from the
eastern part of the Balkan
Mountains.

20. Maritsa River is the
largest river on the
Balkan Peninsula.
Maritza is the most
water river in Bulgaria.
Tributaries of the
Maritsa river are also
Tunja and Arda, but
because they cover
huge areas and run as
independent boundary
rivers flow into the
Maritsa Turkish
territory, they are
treated as separate

22. The largest tributary of the
Maritsa Rive is Tundzha
river. Due to the large
area of the catchment area
(7884 km2), and because
the border runs as a
separate river, Tundzha is
considered as a separate
basin. It springs from the
central part of the mountain
east of Botev peak. Its
length is 350 kilometers to
the border.

24. Arda river is situated in
southern Bulgaria and
northeastern Greece (named
Ardas).
It is about 300 km long (241
km on Bulgarian territory).
Arda springs from Ardin
peak in the Rhodopes
and flows into the Maritza
river on Greek territory near
Edirne.
Arda River dams are Kardjali,
Studen well and Ivaylovgrad.

26. Struma is a river situated
in southwestern Bulgaria.
It springs from Vitosha.
The length of the river on
Bulgarian territory is 290
km.

27. Runs through southwestern
Bulgaria
and in Greece. Formed by the
confluence of the rivers Black and
White Mesta that spring from
Rila mountain. For beginning of
the river is accepted to be the
group of Eastern Rila Lakes. The
altitude of the Bulgarian part of
the river is 1,318 m and with that
Mesta is the highest valley in
Bulgaria. The length of the river
to the border is 126 km. There are
about 25 tributaries.

28. ВОДОСБОРЕН БАСЕЙН НА РЕКА
МЕСТА

29. Sunset over Yantra
Varbitsa River

30. Prepared by the students
of IX grade
, , Ni k ola Voyvodov ”
Secondary school , Vratsa ,
Bulgaria