Following the creation of the Moon and the Sun, the Valar carried out various titanic labours to further improve the defences of Valinor. They raised the Pelóri mountains to even greater and sheerer heights. Off the coast, eastwards of Tol Eressëa, they created the Shadowy Seas and their Enchanted Isles; both the Seas and the Isles presented numerous perils to anyone attempting to get to Valinor by sea.