Horishni Plavni, before 2016 known as Komsomolsk-na-Dnipri or simply Komsomolsk, is a purpose-built mining city in central Ukraine, located on the left bank of the Dnieper, in Kremenchuk Raion of Poltava Oblast, practically conurbated with the larger neighboring city of Kremenchuk. Horishni Plavni hosts the administration of Horishni Plavni urban hromada, one of the hromadas of Ukraine. Population: 49,854.

The Dnieper, also called Dnipro or Dniapro, is one of the major transboundary rivers of Europe, rising in the Valdai Hills near Smolensk, Russia, before flowing through Belarus and Ukraine to the Black Sea. Approximately 2,200 km (1,400 mi) long, with a drainage basin of 504,000 square kilometres (195,000 sq mi), it is the longest river of Ukraine and Belarus and the fourth-longest river in Europe, after the Volga, Danube, and Ural rivers.