Marhachan

Markhachan ^{[2] [3]} - a river in Yakutia , the left tributary of the Lena . The length of the river is 248 km, the catchment area is 4350 km² ^[4] .

Marhachan
Characteristic
Length	248 km
Pool	4350 km²
Watercourse
Source(T) (B)
• Coordinates
Mouth (T) (B)	Lena
• Location	1914 km from the estuary on the left bank
• Coordinates
Location
Water system	Lena → Laptev Sea
A country	Russia
Region	Yakutia
Area	Olekminsky district
HWR code
- source - mouth

It begins in the thermokarst region near the sources of Chyn (a tributary of the Siniy ) ^[2] . It flows in a general south direction parallel to Marhe through larch taiga ^[2] . The floodplain of the river is overgrown with shrubs. In the lower reaches of the river there are six fords ^[5] . It flows into Lena in 1914 km from its mouth on the left bank ^[4] in the tract Rassolensky Island below the village of Markha ^[6] . Above the mouth of Kienestir, the river is 20 meters wide and 1.2 meters deep. The downstream velocity is 1 m / s ^[6] .

The river valley is located on the territory of the Aldan anteclise ^[7] . From the mouth of Markhachan to the village of Baza-Churan along the Lena lies Cambrian deposits about 70 meters thick, in which trilobites of the taxa Protolenus, Bergeroniaspis, Dolichometopinae, Binodaspis were found; rocks of the river valley are represented by bituminous dolomites; trilobites Protolenus, Paramicmacca, Dolichometo pinae are present in them ^[8] . Near the mouth of the river is a paleolithic site ^{[9] [10] [11]} .

The water of the river is brown in spring, the rest of the time is transparent. The ichthyofauna is represented by lenok and grayling . The river belongs to routes of the 3rd category of complexity due to the abundance of rifts. The name of the river comes from the Evenki march - “shrubbery” ^[12] .