The part of the sea that you can see from the land.
The offing is a part of the sea that is not too far away from the land. It is a calm and peaceful place.
Examples:
I can see a boat in the offing.
The offing looks very blue today.
The offing is where the sea meets the sky.
The offing is where the fish live.
The offing is as blue as the sky.
The offing is where the dolphins play.