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Plitvice Pure

Short answer: Plitvice Lakes, in Croatia's Dinaric karst, are a chain of lakes linked by waterfalls. The water is supersaturated with calcium carbonate, which settles out with help from mosses, algae and bacteria to build porous tufa (travertine) barriers that dam the lakes.

These barriers are the park's UNESCO 'outstanding universal value'. The water is clear and low in nutrients (oligotrophic), and tufa forms only when dissolved organic carbon stays low. Croatia proclaimed Plitvice its first national park on April 8, 1949, UNESCO inscribed it on October 26, 1979, and the park was enlarged in 1997 to just under 300 km².

VideoWrite-up4 sources

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What should you know about Plitvice Pure?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Plitvice's lakes are held back by tufa barriers of calcium carbonate.

    DD-717-F01 · Write-up · Exhibit A (Lakes built by stone)

  2. Plitvice became Croatia's first national park on April 8, 1949.

    DD-717-F02 · Write-up · Exhibit E (Protection)

Video transcript: Plitvice Pure: Croatia's Lakes, Dammed by Living Stone

DID YOU KNOW? The water in Plitvice Lakes National Park is exceptionally clear, often allowing visibility down several meters to the lake bed. This clarity comes from the region's unique travertine formation process, where mineral-rich water continuously deposits calcium carbonate, naturally filtering out impurities and trapping sediments. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 17.6s Reel ·

Video coming soonPlitvice Pure · Instagram Reel
Plitvice Pure: Croatia's Lakes, Dammed by Living Stone Instagram Reel · · 17.6s

The write-up

Croatia's lakes, dammed by living stone. Calcium carbonate settles out as tufa barriers that hold back the lakes.

  1. Exhibit A

    Lakes built by stone

    Water flowing over limestone and dolomite has deposited tufa (travertine) barriers over thousands of years, creating natural dams that hold back a chain of lakes, caves and waterfalls. The process is still going on.

  2. Exhibit B

    Chemistry plus life

    The water is supersaturated with calcium carbonate. Calcite crystals stick to the sticky secretions of algae and bacteria living on mosses, and the barriers grow from there.

  3. Exhibit C

    Conditions

    The park lists the requirements for tufa to form: strong carbonate supersaturation, a pH above 8, and dissolved organic carbon below 10 mg per liter.

  4. Exhibit D

    Why it's clear

    The lake water is low in nutrients, and the system deposits roughly 10,000 tonnes of calcium carbonate a year as tufa and lake-bottom marl. Fine particles settle or are trapped, which keeps the water clear.

  5. Exhibit E

    Protection

    Croatia made Plitvice its first national park on April 8, 1949. UNESCO inscribed it in 1979, and in 1997 it was expanded to cover the lakes' catchment, just under 300 km².

Questions people ask about Plitvice Pure

What forms the natural dams at Plitvice?

Tufa (travertine) barriers of calcium carbonate.

Source: Write-up · Exhibit A (Lakes built by stone) · UNESCO World Heritage Centre: Plitvice Lakes National Park

When did Plitvice become a national park?

April 8, 1949.

Source: Write-up · Exhibit B (Chemistry plus life) · Plitvice Lakes National Park: How tufa is formed; Emeis, Richnow & Kempe (1987), Travertine formation in Plitvice National Park, Yugoslavia: chemical versus biological control, Sedimentology

When was Plitvice inscribed on UNESCO's World Heritage List?

October 26, 1979.

Source: Write-up · Exhibit E (Protection) · Plitvice Lakes National Park: General information; UNESCO World Heritage Centre: Plitvice Lakes National Park

Which living things help tufa form?

Calcite sticks to their secretions.

Source: Write-up · Exhibit B (Chemistry plus life) · Plitvice Lakes National Park: How tufa is formed; Emeis, Richnow & Kempe (1987), Travertine formation in Plitvice National Park, Yugoslavia: chemical versus biological control, Sedimentology

Above what pH must the water be for tufa to form?

A pH above 8.

Source: Write-up · Exhibit C (Conditions) · Plitvice Lakes National Park: How tufa is formed

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. What forms the natural dams at Plitvice?

    1. Tufa barriers
    2. Ice
    3. Lava
    4. Beaver dams
    Show the answer

    Answer: A. Tufa barriers Tufa (travertine) barriers of calcium carbonate. Source: Write-up · Exhibit A (Lakes built by stone) · UNESCO World Heritage Centre: Plitvice Lakes National Park

  2. When did Plitvice become a national park?

    1. 1872
    2. 1949
    3. 1979
    4. 1997
    Show the answer

    Answer: B. 1949 April 8, 1949. Source: Write-up · Exhibit B (Chemistry plus life) · Plitvice Lakes National Park: How tufa is formed; Emeis, Richnow & Kempe (1987), Travertine formation in Plitvice National Park, Yugoslavia: chemical versus biological control, Sedimentology

  3. When was Plitvice inscribed on UNESCO's World Heritage List?

    1. 1949
    2. 1979
    3. 1991
    4. 2005
    Show the answer

    Answer: B. 1979 October 26, 1979. Source: Write-up · Exhibit E (Protection) · Plitvice Lakes National Park: General information; UNESCO World Heritage Centre: Plitvice Lakes National Park

  4. Which living things help tufa form?

    1. Mosses, algae and bacteria
    2. Fish
    3. Trees only
    4. Insects only
    Show the answer

    Answer: A. Mosses, algae and bacteria Calcite sticks to their secretions. Source: Write-up · Exhibit B (Chemistry plus life) · Plitvice Lakes National Park: How tufa is formed; Emeis, Richnow & Kempe (1987), Travertine formation in Plitvice National Park, Yugoslavia: chemical versus biological control, Sedimentology

  5. Above what pH must the water be for tufa to form?

    1. 4
    2. 6
    3. 8
    4. 12
    Show the answer

    Answer: C. 8 A pH above 8. Source: Write-up · Exhibit C (Conditions) · Plitvice Lakes National Park: How tufa is formed

Cite this case file

Easterling, Marcus. "Plitvice Pure." The Detail Department (DetailEnjoyer), case file DD-717, last updated May 13, 2026. https://detailenjoyer.com/case/plitvice-pure/

Permalink: https://detailenjoyer.com/case/plitvice-pure/ · Last updated

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