The Danube fan is a relict[clarification needed] sedimentary feature in the northwestern part of the bottom of the Black Sea.
It crosses three of its four major physiographic provinces: basin slope, basin apron, and the Euxine abyssal plain) and splits the abyssal plain into two inequal parts.
[1] The fan was deposited by the Danube (mostly), Dniester, Southern Bug, and Dnieper rivers.
It extends from the shelf break zone an approximately 200m isobath[2] for about 150 km downslope and reaches the depth of about 2,200 m within the abyssal plain.
[3] The fan is a relict from Pleistocene times when the sea level was lower, and at present, little fluvial sediment is being added to the fan; most of material is deposited in the river estuaries.