ISLAND IN THAT OCEAN.

IMAGINE THIS:

The time is 1,000 years ago.

You are a Scandinavian Captain.  Your boat floats on a lake near [what will be called] North Rice River in [what will be called] Minnesota, USA.

You are looking south.  You see the plateau along the horizon.

You call it "Wyn," which means "fine, smooth, cleared of trees."

Later, Europeans will pronounce "Wyn" as "Vin."
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You have the crew row west to [what will be called] the Red River.

Days later your boat is on a lake near [what will be called] Moorhead, MN.

You see the land to the east is still Wynland.

 The land has looked the same every day.
.
The river to the south is not Wyn. 
The river twists and turns across a flat plain. 

It is more marsh than river.
But the crew mucks through to the south.

Then they find a long lake.
That lake is an easy traverse.
You call it "Lake Traverse."  The name will be on the map a thousand years later.

But then comes a hard portage around another swamp.
.

Finally, your crew rows across a lake with big stones.  You call it "Big Stone Lake."  That name will be on the map a thousand years later.

Then your crew rows east through a twisting, turning slow moving river.  Men on the hill side are walking faster than your crew can make progress down the river.

There is so much junk in the water that the crew calls the river "Minnesota," which means "Minimum water flowing in a creek bed almost dry."  That name will be on maps a thousand years later, also

But the land to the north is still Wynland.

. 
Your crew rows on to the east.
There are patches of woods, usually around the many lakes.
The scouts bring back wild grapes and many types of berries.

Men on boats always like to make their brew, when they find grapes.
.

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The crew portages a little, but they make it into a river they call "Mississippi," which means "Mighty Flowing Waters."

You are determined to see if there is a connection to Wynland. So you make the crew row up the Mississippi toward the North.
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Finally, your latitude device tells you that you are near the headwaters of the North Rice River.  

Your scouts confirm that the North Rice River begins on the other side of the marsh in the Northwest.
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Yet, as you look west you see the Wynland.
  
Your crew is restless.  The days are getting colder.

So they make a mucky portage through the swamp.
  
Then you row for home before the ice closes the gate to the ocean.
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When you get back to Norway, your men will have a great story to tell.

"There is a Wynland in that "ocean discovered by many."

 You know because your crew rowed all the way around Wynland, while they were in the ocean discovered by many!
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WYNLAND is an ISLAND in that OCEAN!
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A Horst.
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Wynland of West may be a geographical feature called a Horst.  Wynland may have been uplifted when the Big Event occurred, 13,000 years ago.
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IN AD 1070 ADAM de BREMAN wrote: 
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"... in that ocean discovered by many, which is called Vinland, for the reason that vines grow wild there, which yield the best of wine.  Moreover that grain unseeded grows there abundantly, is not fabulous fancy, but from account of the Danes we know to be a fact."