When using a land-targeting Power with Range "—," which land is the origin land?

When using a land-targeting Power with Range "—," which land is the origin land?

In the rather rare case that it matters, you can choose any land with your Presence to be the origin of the Power.
If you don't have any Presence to use as the origin (e.g., because all of your Presence is under Absolute Stasis or in the Endless Dark), you can't use the Power.