Even in ancient times believed that River again reaches the surface in the form of powerful sources Timavo north - west of Trieste, 2 km from the coast of the Adriatic Sea, off Duipo. Experiments carried out with labeled eels, fluorescein, and more recently with tritium (a radioactive isotope of hydrogen), confirmed this assumption, but the details of the underground road has not yet been clarified. Only two natural "pit" deeper than 300 m from Divatsa and Trebtse allow approximately establish the position of the underground waterway. From the village of Duino Shkotsyansk to a straight line of 39 km falling river at this site is 327 meters water passes it up to 8 days, which corresponds to the average flow velocity 5 -6 cm per second.
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