point b - apex
The aphotic zone: places where they aren't getting any sunlight.
Point D
Fresh water...
It is a fresh water stream.
creek
a fresh water pond
A small body if fresh water in the middle of the desert is known as an oasis.
The body of water where fresh water from a river mixes with salt water is called an estuary. This commonly an enclosed body of water.
A fresh water loch is a significant body of water, generally inland, which is fresh - as opposed to salt - water. A loch is the Scottish term for lake.
A body of fresh water surrounded by land is a lake or pond.
Long Pond