Indeed, before any warriors could even ask Scathach for help, they had to first reach her domain. The woman's fortress, called Dun Scaith (Castle of Shadows), reportedly sat on Isle of Skye northwest of Scotland. Kings and princes who wanted to get there had to cross the Irish Sea, known for its deadly storms and choppy waters, eastward or navigate the cold waters of the Atlantic northward along the craggy islands of western Scotland.