The Vizelj (Serbian: Визељ) is a short channeled river in north-central Serbia, the left tributary to the Danube.

Vizelj originates north of Padinska Skela, in the central part of the Pančevački Rit, a former marshland in the southwestern corner of the Banat region.

In this, upper course, it mostly follows the Zrenjanin Road, between the localities of Nove Livade, on the east, and Galina Greda and Zlobatska Bara, on the west.

Upon exiting Padinska Skela, at the PKB Corporation industrial complex, it receives the stream of Lisičji Potok from the left.

Irgot, section of Stara Borča, is fully situated in the joint meander of Vizelj and Mokri Sebeš, which flows from the left.

It also forms the eastern border of the ada Kožara, which is planned, with the surrounding area, as the future, much larger, artificial Čaplja island.

[5] Jojkićev Dunavac, which makes the final section of the stream, is actually a 6 km (3.7 mi) long canal, cut in the 1950s to drain the soil.

Initial works on the river were done in the second half of the 18th century, during the reign of the empress Maria Theresa, as the area was ruled by Austria at the time.

As the area became rapidly urbanized after the World War II, which was not followed by the adequate communal infrastructure, the Vizelj got more and more polluted.

[14] In April 2014, during the repair of the waste water collector, toxic substances were poured into the river which caused a massive fish kill.

[15] In August 2014, the PKB Corporation apparently discharged large amounts of ammonia into the Vizelj which nearly killed the entire fish population.

As in this section the river is still not polluted, and majority of settlement has a proper sewage system in this area, this was enough for wildlife, including ducks and swans, to return.

[25][26] During the inspections of the gradually ruining complex in February 2019 by the ecologists and reporters, over 300 tons of fossilized animal carcasses and bare bones were found.

The ground was soaked by the large amount of toxic waste, while the animal remains are scattered by the stray dogs, jackals and foxes.

Problem is deepened by the fact that the owner of the lot on which the waste is located is unclear, even in the official cadastre books.

[25] Since none of the institutions accepted the responsibility for the problem, city administration in the end organized the removal of the waste which began in July 2019.

Due to the distance (Sombor is 150 km (93 mi) away from Belgrade) and the specificities of the waste treatment, only one truck weekly will transport the bones, so it is planned for the process to lasts for several months.