[#3Fan]

Oops, didn't mean to post the previous without explaining. Notice the perfect rectangular plain about 100 miles West of Guam on the ocean floor, about 300 miles long and 100 miles wide, like Plato said, lined up rectangularly North, South, East, West. Notice how inside the trench, along with the plain, in the big 1000 long diamond, the ocean floor is much more clearly defined with mountain ranges. Outside the trench it looks like there's been much more build up of sediment, and there's a different kind of distribution of mountains and hills. The diamond looks like a relief map of a Continent. Nowhere else does the ocean floor look this way according to these maps on this National Geographic map page.

[blam]

Neat maps, thanks. I am still leaning toward the Americas.