downmost

Example:The highest peak in the mountain range was visible on the horizon.

Definition:Farthest from the ground or base, lowest on the vertical, or next to the sky.

Example:The uppermost part of the tree was heavily laden with leaves.

Definition:On top, above, highest

Example:The topmost shelf in the bookcase contained all of the rarest volumes.

Definition:Situated at, on, or near the highest or topmost position.