Oh, that makes things so much simpler! "Thank you. I'll be there if you need me." (Another apparently-pointless truism that people say sometimes and so he finds himself saying it too without thinking.)
He's had a very stressful day. Being alone is appreciated. Ahmose tries to sit and rest, but dwelling on his thoughts only makes him more anxious. Portals it is, then.
He still can't see any way to direct a interplanar portal, to revisit or avoid any specific destination. And the portals still take so much power that he can only have one open at a time (just barely, what with the portal he's also keeping open to Chicago). But he can make two more eye-sized pinholes, and that's enough to chain portals and explore the far side.
The pattern that emerges is:
- Most portals go to space. He can't tell if it's the same field of stars every time; it would take too long to draw the stars each time, and he doesn't have a great visual memory. There's no nearby sun large enough to show a disc, or anything else of interest.
- About one in twenty goes to the water-world. Portals a few hundred miles up show only a few bare islands poking above water; he reluctantly admits this is not, after all, a river. (Seas seem like such a waste, they take up valuable space and you can't even use them for irrigation.) There might be more land on the far side of the planet; it would take him a day to be sure. The portal seems to be opening in the same place every time, judging by the sun.
- Several times, the portal opens inside earth or stone or something else solid. It's hard to tell since he can't make more portals into it, and he doesn't want to try to get a sample without Jasper to tell him how to do it through the ward.
This is presumably the Elemental Plane of Earth, since as Jasper correctly pointed out, in most planes with planets or at least an open sky, most space that the portal could randomly target would be empty. But then, how can he reach the sea-world planet? For that matter, why does the portal open just above the water, and not below or far above it? Ahmose is painfully aware he does not understand how this works, and is cautiously optimistic that with the help of wizards (or wizard-minded people, anyway) they can make some progress studying this.
He can't identify any of the other planes. They could be the Elemental Plane of Water (if it has water-planets and not just, like, water all through), or Air or Fire (for the gas giant), or any outer plane that has space with stars. The same moral luck that hopefully prevents him from blindly opening a portal that cuts someone's head off also seems to ensure he never opens one he can see someone's head through.
Ahmose keeps opening portals and cycling through various unpleasant emotions about not making any progress and not having any idea of what to do differently. He can't stop thinking about maybe being stuck in this world, and he also can't think anything useful about it. He's going to try the boat idea, even if it means he might die, because the alternative is giving up on everything and feels that he can't - think that thought yet.
Eventually he can't ignore his hunger and tiredness any longer and goes in search of food and some distraction from his thoughts.