Stormhaven (aka Storm Haven) is the royal city, and location of a castle citadel of Westland. It is home to King Otto and Lakmir, while Aronde rules in Kal Torlin. It is located northwest of Tyre Sea along the western edge of the sea. It is also the location of Castle Stormhaven which is seen on some of the country's coins.
There was a backstory as Lakmir was the survivor of the Hero Kings that were slewed by the warlock. They were able to seal him away to Shadowgate. Both it and Stormhaven were located in a world named Tyragon. Shadowgate's in a land called Kal Zathymn at the top of Gatekeeper Mountain.
Dissidia: Shadowgate[]
Ikran doesn't highlight the place much. Though it was the place where Firion, Luneth, and the other warriors minus the Warrior of Light, start their journey as soon as they emerged from the woods. They actually wound up at Castle Stormhaven in the courtyard; they were surprised there were no Chocobos, but a random jester greeted them and escorted them to the remaining surviving heroes. They reunited with the group that was previously killed by the endless horde of Manikins as they closed The Rift. Then, the same jester announced King Lakmir is awaiting his audience. In the throne room, they also met up with Shantotto and Prishe, the first warriors that wound up there. He ordered the large team to infiltrate Castle Shadowgate and prevent the warlock lord on rising the Behemoth that'd ruin this world as well as their home planets.
After Shadowgate was destroyed, the large group of Cosmos warriors wound up back in Stormhaven via Teleports by Cecil, Prishe and Terra. One by one, each of the heroes faded to their own homelands once the power of the Crystals ran out.