 Its right hand tributaries are the 74 km long Moskvichka, the 84 km long Posadochnaya, the 94 km long Gryadovaya and the 93 km long Graviynaya.The area of the Shrenk basin is a largely uninhabited and desolate expanse without modern infrastructures.It was explored by Russian biologist and explorer Alexander von Middendorff in 1843.