Land of the Undying?

[Gwaihir the Windlord]

Exactly. Beyond the circles of the world, but not the straights of the world.

a ship can only circle the globe unless it enters the Straight Road.

If it enters the Straight Road, it enters another dimension within this world, I should say.

To the Valar, the Undying Lands are still within the World. If Valinor is in the middle of the Atlantic, say, and a ship sets out west from it, it would reach the West coast of Europe or Africa, as long as the Valar consented it be so. Otherwise the ship would inexplicably find itself heading back towards Valinor again. (This is my theory.) But if a ship of Men set out on a path that would bring it straight to Valinor, then it would travel a 'bent path', perhaps around the Undying Lands or right through them without ever knowing they were there. Satellite images don't pick them up, similar to the way a vampire cannot be seen in a mirror. But from Valinor itself the story is different.
Do you catch my meaning?