The Dyanyshka (Russian: Дянышка; Yakut: Дээнискэ, Deeniske), also known as Kobycha (Russian: Кобыча), is a river in the Kobyaysky District of the Sakha Republic (Yakutia), Russia. It is the 28th longest tributary of the Lena, with a length of 332 kilometres and a drainage basin area of 13,300 square kilometres. There are no settlements in the area of the Dyanyshka.
The river is located in the Ust-Vilyui Natural Park area. Whitefish, lenok, pike and taimen, among other species, are abundant in the waters of the river. On the International scale of river difficulty the Dyanyshka is a Class II – IV destination for rafting and kayaking.
