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    The Soča river with its turquoise water flowing round a large tree-topped rock near Kamno, among riverside woodland

    Running water

    Slovenia's rivers and what to do on each one

    Facts checked on
    Longest river
    Sava, 221 km
    Watercourses
    Nearly 30,000 km
    Warmest
    Kolpa

    Of Slovenia's rivers, nearly 30,000 km of watercourses, five matter to visitors. The emerald Soča for rafting and pools; the Sava, the longest at 221 km; the Drava through Maribor and Ptuj, with its own cycle route; the Mura in the north-east, a biosphere reserve; and the Kolpa, the warmest, along the Croatian border. The Krka is the only one that builds tufa barriers.

    What I would do

    The Soča is the river for photos and rafting, but for a lazy summer day in the water I'd pick the Kolpa, warm, calm and almost empty. And if you cycle, the Drava has its own route along the whole river.

    If you only read this

    Full read: 2 min

    • The Sava is the longest river, with 221 km in Slovenia.
    • The Soča is the emerald one, for rafting and kayaking.
    • The Kolpa is the warmest and the best for swimming.
    • The Krka is the only river with tufa barriers.

    Who I would recommend it to

    Yes, if…

    • Swimmers, who should head for the Kolpa
    • Rafters and kayakers, for the Soča
    • Cyclists, for the Drava route

    Better not, if…

    • Anyone expecting warm water in the Soča
    • Visitors short of time who only want the lakes

    What I would book

    My key points

    Before you go to Slovenia, this

    1. 01 Most beautiful

      The Soča, the emerald river

      This is the green river from the photos, famous for Soča trout and white water for rafting and kayaking. The tourist board puts it first on its list of rivers not to miss.

      Soča river
    2. 02 My tip

      The Sava has two sources

      The Sava Dolinka rises at Zelenci and the Sava Bohinjka at Savica Falls. They meet at Radovljica, and from there the river crosses the country and leaves it at Brežice.

      Sava River in Slovenia
    3. 03 Most beautiful

      The Krka, green thanks to its tufa

      It's the only river in Slovenia with tufa barriers, which give it its colour, and the tourist board counts around 30 beaver families along its banks.

      Krka River in Slovenia
    4. 04 To save money

      The Kolpa, free swimming in the warmest river

      It rises at the edge of the Kočevje forests and flows through Bela Krajina. The tourist board calls it Slovenia's warmest river, with campsites and glamping along the banks.

      Kolpa River
    5. 05 My tip

      Where the Ljubljanica resurfaces

      Vrhnika, the Roman Nauportus, is where the Ljubljanica that flows through the capital rises, after vanishing several times under the Karst.

      Vrhnika

    Which Slovenian river can you swim in?

    The Kolpa river is the answer. Springing up where the Kočevje forests end, it marks the Croatian border along Bela Krajina, and the tourist board rates it Slovenia’s warmest river. There are campsites and glamping along its banks, and it’s where I’d spend an unhurried summer day.

    In Dolenjska, the Krka river is another good option, with bathing spots at Žužemberk, Straža and Kostanjevica na Krki. It’s the only river in Slovenia with tufa barriers, which give it its green colour, and around 30 beaver families live on its banks.

    The Soča, the one everybody wants to see

    The Soča river is the famous one. It has that emerald green that doesn’t look real, plus gorges, pools and white water for rafting and kayaking, and anglers know it for the Soča trout. For me it’s the most beautiful river in the country, and in summer also the busiest.

    The Drava and the Mura, rivers of the east

    The Drava enters Slovenia at Dravograd and leaves at Ormož. It passes Maribor, home of the world’s oldest vine, and Ptuj, among vineyard hills, before opening out onto the Pannonian plain. The best way to see it, according to the tourist board, is by bike along the international Drava cycle route.

    The Mura is lazier, with backwaters and meanders such as the so-called Island of Love. The Mura area is a UNESCO biosphere reserve thanks to its biodiversity, and you can still cross it by ferry and visit the restored mill at Ižakovci.

    Once your dates are set, check which hotels are still free in Bovec before prices climb.

    The Sava, the longest

    The Sava river is the longest, with 221 km in Slovenia according to the government. Oddly, it has two sources. The Sava Dolinka emerges in the Zelenci nature reserve and the Sava Bohinjka at Savica Falls, and the two meet at Radovljica. From there it crosses the Ljubljana basin and reaches Posavje as a calm river, leaving the country at Brežice. Upstream there’s rafting; downstream, at Radeče, wooden timber rafts still carry visitors.

    The rivers that belong only to Slovenia

    Besides the big rivers that cross borders, the tourist board picks out several that are purely Slovenian. The Ljubljanica rises at Babno Polje, disappears several times under the Karst and resurfaces before flowing through the capital. The Savinja springs up in the Logar Valley, among the Kamnik-Savinja Alps. And the Vipava has a source shaped like a delta, which the tourist board describes as unique in Europe.

    If I had to pick one plan per river, it would be rafting on the Soča, canoeing on the Krka, cycling beside the Drava, a ferry on the Mura and a swim in the Kolpa.

    If you would rather have a local show you round, book a guided tour in Bovec and choose by the reviews.

    Once your dates are set, check which hotels are still free in Bovec before prices climb.

    The rivers that matter most to visitors

    RiverWhere it flowsWhat to do
    SočaSoča Valley (Bovec, Kobarid, Tolmin)Rafting, kayaking, fishing, river pools
    SavaUpper Carniola, Ljubljana, Posavje, BrežiceRafting upstream, timber rafts and fishing at Radeče and Sevnica
    DravaDravograd to Ormož via Maribor and PtujDrava cycle route
    MuraPomurjeFerry and mill at Ižakovci, Island of Love
    KolpaBela Krajina, Croatian borderSwimming, canoeing, campsites
    KrkaDolenjska, from Suha Krajina to BrežiceCanoeing, fishing, swimming at Žužemberk, Straža and Kostanjevica
    LjubljanicaLjubljana Marshes and the capitalBoat trips through the centre
    SavinjaLogar Valley and Savinja valleyGorges and mountain walks

    Slovenian Tourist Board, “Rivers” and “Dolenjska”, and Government of Slovenia, “About Slovenia” (length of the Sava), checked on 15 October 2026.

    The Kolpa river flowing quietly between stones and riverside woods, under overhanging branches, in Bela krajina

    The Kolpa river flowing quietly between stones and riverside woods, under overhanging branches, in Bela krajina

    Tree-covered tufa islets in the River Krka just upstream of Otočec Castle, with dense woodland behind

    Tree-covered tufa islets in the River Krka just upstream of Otočec Castle, with dense woodland behind

    Test yourself

    True or false?

    0/3 Pick before you peek.

    1. The Soča is the longest river in Slovenia.

      See the answer

      False. The longest is the Sava, at 221 km according to the government.

    2. The Krka is the only Slovenian river with tufa barriers.

      See the answer

      True. The Dolenjska tourist board says so, and those barriers give it its green colour.

    3. The Mura area is a UNESCO biosphere reserve.

      See the answer

      True. The tourist board says the Mura region is on UNESCO's list of biosphere reserves for its biodiversity and oxbow lakes.

    Length of the Sava in Slovenia
    221 km
    Watercourses, almost
    30,000 km
    Beaver families on the Krka, roughly
    30
    Rivers the tourist board says not to miss
    5

    Frequently asked questions

    What is the longest river in Slovenia?

    The Sava, with 221 km inside Slovenia according to the government. It starts as two branches, the Sava Dolinka and the Sava Bohinjka, which meet at Radovljica, and leaves the country at Brežice.

    Which river flows through Ljubljana?

    The Ljubljanica. It rises at Babno Polje, vanishes several times under the Karst and resurfaces before running through the capital, according to the tourist board. In the centre you can take a sightseeing boat.

    What is the emerald river in Slovenia?

    The Soča, in the west of the country. Its emerald green colour, gorges and white water make it the best-known river in Slovenia and the main rafting and kayaking spot.

    Which Slovenian river is best for swimming?

    The Kolpa, which the tourist board calls the warmest river in Slovenia. On the Krka there are bathing spots at Žužemberk, Straža and Kostanjevica na Krki. The Soča has pools, but it's more of an adventure river than a swimming one.

    Can you take a river cruise in Slovenia?

    Not in the big-ship sense. You can take sightseeing boats on the Ljubljanica in the capital, a traditional timber raft on the Sava at Radeče and a small ferry across the Mura at Ižakovci.

    What is special about the Vipava river?

    It rises as a delta of many springs close together. The tourist board describes this as the only example in Europe and a rarity worldwide.

    0 of 425 Slovenia guides

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    1. Sava River
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    3. Krka River
    Sergio Lepone

    Questions about Slovenia? Write to me

    I read every email. If a fact is wrong or missing, tell me and I will check it.

    My email sergiolepone@gmail.com

    Sergio Lepone

    By

    Tourism graduate with a master’s in Tourism Management and Planning from the University of Málaga, who has travelled across Europe. He writes every guide from official sources and his own judgement.

    Published on . Updated on . Facts checked on .

    How I check every fact and where it comes from

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    Photos: Krzysztof Golik (CC BY-SA 4.0); Klemen Čotar (CC BY-SA 4.0); Savinjc at Slovenian Wikipedia (CC BY-SA 3.0), via Wikimedia Commons.