| Derba Дерба / Дьэрбэ | |
|---|---|
 Lena basin with the Derba in the middle | |
  Mouth location inYakutia, Russia | |
| Location | |
| Country | Russia |
| Physical characteristics | |
| Source | |
| • location | Central Siberian Plateau |
| • coordinates | 61°40′43″N116°16′40″E / 61.67861°N 116.27778°E /61.67861; 116.27778 |
| • elevation | 292 m (958 ft) |
| Mouth | Lena |
• coordinates | 60°26′40″N116°43′37″E / 60.44444°N 116.72694°E /60.44444; 116.72694 |
• elevation | 149 m (489 ft) |
| Length | 299 km (186 mi) (320 kilometres (200 mi)) |
| Basin size | 8,780 km2 (3,390 sq mi) |
| Basin features | |
| Progression | Lena→Laptev Sea |
TheDerba (Russian:Дерба), also known asDerbe (Russian:Дербе;Yakut:Дьэрбэ,Cerbe) orDzherba (Russian:Джерба), is a river inYakutia (Sakha Republic),Russia. It is a tributary of theLena with a length of 299 kilometres (186 mi) —320 kilometres (200 mi) counting the Mas-Turukhtaakh at its head— and adrainage basin area of 8,780 square kilometres (3,390 mi2).[1]
The river flows across an uninhabited area of theLensky District.[2]
The Derba is a lefttributary of the Lena. It is formed at the confluence of the Kyuyokh-Ottakh (Кюёх-Оттоох) and Mas-Turukhtaakh (Мас-Турухтаах) rivers in the eastern fringes of theCentral Siberian Plateau, to the south of the basin of theVilyuy. The river heads in a roughly southern direction acrosstaiga areas dotted with lakes. In its lower course it flows to the east of theNyuya as it reaches the Lenafloodplain and flows slowly in a swampy area. Finally it meets the Lena 2,395 kilometres (1,488 mi) from its mouth, 25 km (16 mi) east of the mouth of the Nyuya.[3]
The largest tributaries of the Derba are the 146 kilometres (91 mi) longErgedey (Эргэдьэй) and the 51 kilometres (32 mi) long Dyukta that join it from the left. There are 330 lakes in its basin. The Derba freezes yearly between October and May.[1]
