Yablochkov is a ruined lunar impact crater that is located on the northern hemisphere of the Moon's far side.
It lies almost due south of the large walled plain Schwarzschild.
Both the rim and interior of this feature have been heavily damaged by subsequent impacts, leaving a formation that is little more than a rugged depression in the surface.
There is a crater-like depression along the southeast inner wall and the floor is marked by several small craterlets.
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Yablochkov.