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{{Infobox river
| name              = Ostravice
| image             = Ostravice river Ostrava Czech republic 02.JPG
| image_caption     = The Ostravice in Ostrava
| source1           = Bílá Ostravice
| source1_location  = [[Bílá (Frýdek-Místek District)|Bílá]], [[Hostýn-Vsetín Mountains]]
| mouth_location    = [[Oder]]
| mouth_coordinates = {{coord|49|52|10|N|18|16|50|E|display=it}}
| progression       = {{ROder}}
| subdivision_type1 = Country
| subdivision_name1 = [[Czech Republic]]
| subdivision_type2 = [[Regions of the Czech Republic|Region]]
| subdivision_name2 = [[Moravian-Silesian Region|Moravian-Silesian]]
| length            = {{convert|64.7|km|abbr=on}}
| source1_elevation = {{cvt|751|m}}
| mouth_elevation   = {{cvt|199|m}}
| discharge1_avg    = {{convert|15.4|m3/s|abbr=on}} near estuary
| basin_size        = {{convert|826.7|km2|abbr=on}}
}}
The '''Ostravice''' ({{langx|pl|Ostrawica}}, {{langx|de|Ostrawitza}}) is a [[river]] in the [[Czech Republic]], a right [[tributary]] of the [[Oder]] River. It flows through the [[Moravian-Silesian Region]]. It is formed by the confluence of the Bílá Ostravice and Černá Ostravice streams. Together with the Bílá Ostravice, which is its main source, the Ostravice is {{convert|64.7|km|abbr=on}} long. Without the Bílá Ostravice, it is {{convert|54.8|km|abbr=on}} long.

==Etymology==
The name is derived from the Czech word ''ostrá'' (literally 'sharp', but here figuratively meaning 'fast flowing'). The river was initially called Ostrá. The city of [[Ostrava]] was named after the river.<ref name=ostrava>{{cite web |title=Důvod a způsob založení|url=https://www.ostrava.cz/cs/urad/povinne-zverejnovane-informace/na-teto-strance-zahrnuji/i.-povinne-zverejnovane-informace-organu-verejne-spravy/1.-nazev/duvod-a-zpusob-zalozeni|publisher=City of Ostrava|language=cs|access-date=2024-10-03}}</ref>

The sources of the river are called Bílá Ostravice ('white Ostravice') and Černá Ostravice ('black Ostravice'). The colours in the names of the rivers most often appeared according to the nature of the river bed (white = stony river bed, black = muddy river bed).<ref>{{cite web |last=Šmilauer|first=Vladimír|title=O původu názvů českých řek|url=http://nase-rec.ujc.cas.cz/archiv.php?art=3983|work=Naše řeč|publisher=[[Institute of the Czech Language]]|language=cs|access-date=2024-10-03}}</ref>

==Characteristic==
[[File:Ostrava - soutok Ostravice a Lučiny.jpg|thumb|Confluence of the Ostravice (right) and Lučina]]
From a water management point of view, the Ostravice and Bílá Ostravice are two different rivers with separate numbering of [[River mile|river kilometres]]. In a broader point of view, the Ostravice (as Bílá Ostravice) originates in the territory of [[Bílá (Frýdek-Místek District)|Bílá]] on the border between the [[Hostýn-Vsetín Mountains]] and [[Moravian-Silesian Beskids]] at an elevation of {{cvt|751|m}} and flows to [[Ostrava]], where it enters the Oder River at an elevation of {{cvt|199|m}}. It is {{convert|64.7|km|abbr=on}} long. Its [[drainage basin]] has an area of {{convert|826.7|km2|abbr=on}}. The name Ostravice is used from the confluence of the Bílá Ostravice with the Černá Ostravice on the municipal border of Bílá and from this point to the confluence with the Oder, the river is {{convert|54.8|km|abbr=on}} long.<ref name=dibavod>{{cite web |title=Základní charakteristiky toku Ostravice a jeho povodí|url=https://www.dibavod.cz/download.php?id_souboru=2352|publisher=T. G. Masaryk Water Research Institute|language=cs|access-date=2024-10-03}}</ref>

The sources and longest tributaries of the Ostravice are:<ref>{{cite web |title=Vodní toky|url=https://mapy.chmi.cz/ords/chmi_app/r/fewshlprf/stream-list?|work=Evidence hlásných profilů|publisher=[[Czech Hydrometeorological Institute]]|language=cs|access-date=2024-10-18}}</ref>
{| class="wikitable"
|-
! Tributary !! Length (km) !! River km !! Side
|-
| [[Lučina (river)|Lučina]] || 38.6 || 4.5 || right
|-
| [[Morávka (river)|Morávka]] || 29.6 || 24.9 || right
|-
| Olešná || 21.5 || 15.2 || left
|-
| [[Čeladenka]] || 17.3 || 37.1 || left
|-
| Bílá Ostravice || 9.9 || 54.8 || –
|-
| Černá Ostravice || 9.4 || 54.8 || right
|}

==Flow==
The largest settlement on the river is the city of [[Ostrava]]. The river flows through the municipal territories of [[Bílá (Frýdek-Místek District)|Bílá]], [[Staré Hamry]], [[Ostravice]], [[Frýdlant nad Ostravicí]], [[Pržno (Frýdek-Místek District)|Pržno]], [[Baška (Frýdek-Místek District)|Baška]], [[Staré Město (Frýdek-Místek District)|Staré Město]], [[Frýdek-Místek]], [[Sviadnov]], [[Žabeň]], [[Paskov]], [[Řepiště]], [[Vratimov]] and Ostrava.

In terms of natural regions, the river flows through the [[Moravian-Silesian Beskids]], [[Moravian-Silesian Foothills]] and [[Ostrava Basin]]. The Bílá Ostravice springs in the area of the [[Hostýn-Vsetín Mountains]], but immediately leaves this region.

==Bodies of water==
[[File:Šance - panoramio.jpg|thumb|[[Šance Reservoir]]]]
There are 598 bodies of water in the basin area.<ref name=dibavod/> The largest of them is the [[Šance Reservoir]] with an area of {{cvt|306|ha}}, built on the Ostravice. It was built in 1964–1969 and its primary purpose is to supply Ostrava and its surroundings with drinking water and protect the area behind the reservoir against floods.<ref>{{cite web |title=VD Šance|url=https://infocentrumsance.pod.cz/vodni-dilo-sance/|publisher=Povodí Odry, s.p.|language=cs|access-date=2024-10-03}}</ref>

==Fauna==
Common species of fish in the river are [[trout]], [[Thymallus thymallus|grayling]] and [[common barbel]]. Among the protected animal species are the [[common minnow]], [[burbot]], [[European bullhead]], [[Alpine bullhead]] and [[brook lamprey]]. The river is a nesting place for the [[common kingfisher]]. The [[Eurasian otter]] rarely occurs on the middle course of the river.<ref name=pod>{{cite web |title=Ostravice|url=https://www.pod.cz/atlas_toku/ostravice.html|work=Atlas vodních toků povodí Odry|publisher=Povodí Odry, s.p.|language=cs|access-date=2024-10-03}}</ref>

==History==
[[File:Rozvodněná Ostravice v Ostravě (ulice Muglinovská), 14-09-2024.jpg|thumb|The Ostravice in Ostrava during the [[2024 European floods|2024 floods]]]]
The Ostravice partly formed the border between historical lands of [[Moravia]] (left bank) and [[Cieszyn Silesia]] (right bank). It was first agreed as such in 1261 by a special treaty between Duke [[Władysław Opolski]] and King [[Ottokar II of Bohemia|Ottokar II]]. Later it was confirmed on 2 August 1297 between Duke [[Mieszko I, Duke of Cieszyn|Mieszko I]] and [[List of Roman Catholic bishops and archbishops of Olomouc|Dětřich, bishop of Olomouc]].<ref>{{cite book |last=Panic|first=Idzi|author-link=Idzi Panic|title=Śląsk Cieszyński w średniowieczu (do 1528)|trans-title=Cieszyn Silesia in Middle Ages (until 1528)|publisher=Starostwo Powiatowe w Cieszynie|year=2010|location=Cieszyn|pages=50, 272, 400|language=pl|isbn=978-83-926929-3-5}}</ref> It lost importance as a state border in 1327, when the [[Duchy of Teschen]] became a [[Fee (feudal tenure)|fee]] of the [[Kingdom of Bohemia]].<ref name=ostrava/>

Before the construction of reservoirs in the basin, the Ostravice was one of the most fluctuating rivers in the Czech Republic in terms of flow, and its high peak flows in combination with the relief were the cause of catastrophic floods. Among the worst floods were those in 1902 and 1903, and after them came a period of gradual flow regulation, culminating in the construction of the [[Šance Reservoir]] on the Ostravice, [[Žermanice Reservoir]] on the Lučina, [[Morávka Reservoir]] on the Morávka and Olešná Reservoir onn the Olešná.<ref name=pod/>

==Tourism==
The Ostravice is suitable for [[nautical tourism|river tourism]] only when water is released from Šance Reservoir, which is once or twice a year. About {{cvt|7|km}} of the river is navigable.<ref name=pod/>

==See also==
*[[List of rivers of the Czech Republic]]

==References==
{{reflist}}

==External links==
{{commons category|Ostravice (river)}}
*[https://hydro.chmi.cz/hppsoldv/hpps_prfdyn.php?seq=307105 River flow at Ostrava station] – Flood Warning and Forecasting Service of the [[Czech Hydrometeorological Institute]]

{{Tributaries of the Oder}}
{{authority control}}

[[Category:Rivers of the Moravian-Silesian Region]]
[[Category:Moravian-Silesian Beskids]]
[[Category:Cieszyn Silesia]]

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