What is the name of the stretch of water between the North and South Islands?

What is the name of the stretch of water between the North and South Islands?
Cook Strait.

The ferry crossing from Wellington to Picton is one of the most beautiful in the World.

Enjoy.
What is the name of the stretch of water between the North and South Islands?
The River Mersey
The River Mersey
Cook Strait
Definitely not the River Mersey.

Cook Strait is correct, and I can see it from my house. The sun is shining on it today, and it looks very calm.
The ferry trip to Picton is very nice.

but not on a rough day. and the cook straight does get rough..

cheers