Eijkman is a lunar impact crater that is located on the far side of the Moon's southern hemisphere.
The rim of this crater is well-defined and has not been significantly worn down by impacts.
[1] The inner walls display some minor terracing along the northwestern edge.
Near the midpoint of the crater interior floor is a horseshoe-shaped central peak formation, with the open end pointing towards the south.
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Eijkman.