The Oshta (, ) is a river in Vytegorsky District, Vologda Oblast, Russia. It flows from Lake Oshtozero into the Onega Canal and has a length of .
Geography The Oshta is long and its basin covers an area of . The source of the river is Lake Oshtozero, located in the Vepsian Upland (), from where it flows into Lake Onega via the Onega Canal. The river drops a total of and has a stream gradient of . Much of this is in the upper and middle course of the river, where multiple rapids are located. Around the mouth, a sedge-dominated wetland stretches for some .
Tributaries of the river include the Keskas-ruchey ( from mouth), Verkhnyaya Orovashka ( from mouth) and Cheleksa rivers ( from mouth), as well as Lake Urozero.
The biggest settlement along the river is also named Oshta. Other settlements include Simanovo and Kurvoshsky Pogost.
Environmental values Based on measurements taken between 30 July and 2 August 2024, the water of the Oshta had a pH of 7.9, while the level of total dissolved solids was .
Before the direct connection with Lake Onega was cut off by the Onega Canal, salmon entered the river to spawn.
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