a marker on your map appears, its southeast of the imperial city. it should be on a small island, and you should be able to find you way from there its not right there, but its down the river, SW of the imperial city. ------------ it's in the middle of niben bay and it will only be there if you have the expansion pack. also, once you've installed it, a pop-up should appear after a while of playing, putting a marker on your map, showing you where it is ------------ These 2 are correct, but you have to have the shivering isles expansion pack.
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First you need to have the Game of the Year Edition or the Shivering Isle Download. "A Strange Door" should be marked on you map. It is located in the middle of the lake near Bravil. Going through this portal brings you to the Shivering Isle.
You can't buy any in the isles
There two "best" armor types in Shivering Isles. Perfect Amber is the best light armor, Perfect Madness is the best set of heavy armor.
run around imperial city and you should get the quest which will give u the location of shivring ilses :0
the Shivering Isle is in the game of the year edition, although you have to unlock it by finding the lost orb of shivering kings. this will unlock the island when you bring it to either the King of Tamriel. you can change events on the Island by giving the Orb to either the King or The Head of theives guild.
After around 24 hours, you'll get a journal message about a gate opening on an island. Follow it's goal to the sea where it points. Go through the gate, and there you go.