downmost

Example:The lowest point of the river was just above the dam.

Definition:At the bottom of all or any of a set, series, kind, grade, or other classification.

Example:The deepest part of the ocean is home to unique species of marine life.

Definition:At the bottom of a hollow or the lowest part of a space or surface.

Example:The undermost layer of soil was rich in minerals.

Definition:Occupying the lowest place or position.