Velykyi Kuyalnik
The Velykyi Kuyalnik, or Bolshoy Kuyalnik is a river in Podilsk, Ananyiv, Shyriaieve, and Ivanivka Raions of Odessa Oblast in Ukraine. Its mouth is the Kuyalnik Estuary of the Black Sea. The length of the river is, and the area of its drainage basin is. The urban-type settlements of Shyriaieve and Ivanivka are located on the banks of the Velykyi Kuyalnik.
In the past, the Velykyi Kuyalnik was navigable and, together with the Dniester, was used to transport goods to the Black Sea, bypassing the cascades at the Dnieper River. In 2007-2008, illegal sand diggers built a dam in the mouth of the Velykyi Kuyalnik, so that the river does not empty to the sea anymore. The dam has never been demolished, leading to drying out of the estuary.