The Great Triangle (TGT) is very big, containing 10716 Ultra-boxes in it.
The Great Triangle is a strange fractal shape made out of Ultra-boxes, that appears to be a triangle with a white outline when viewed from any angle. However, upon being entered, it visually engulfs the person, like a portal.
The rim of The Great Triangle is made out of Adadai-2, while the inner matrix is made out of Adadai-. Since finding the fractals that work for civilizations is made efficient using formulas, the design for The Great Triangle was done so that it would be easier to navigate in than the Ultra-boxes. This involved generating a very specific fractal pattern, with enough boxes for the coordinate system to actually work and be specific enough.