The Mount Hoyla

Mount Hoyla is once again on the border but belongs to no one. At the end of the last wars every King agreed to keep it's gates locked and no one could enter. To gain access you would have to get past it's four guards and The 5 Keys from each kingdom. The Mountain is said to be the Highest thing in the world, from it you can see all. It is also almost impenetrable if an army wishes to invade it, so whoever controls it will have enough food to last for years and hold out in a siege.