Use 'uppermost' to describe the physical highest part of something. Careful with the vase on the uppermost shelf!
Pro Tip 2/3
Hard to Access
'Uppermost' implies a spot that may be difficult to reach without assistance. The book I need is on the uppermost shelf, so I’ll need a ladder.
Pro Tip 3/3
Visual Impact
In visual contexts, 'uppermost' draws the viewer's attention to the top area. The artist painted the mountain as the uppermost feature in the landscape.