Grand Bridge of the Empire

The massive Grand Bridge of the Empire was built 3,000 years ago to connect Oppara with the southern shore of River Porthmos. It emerges from Grandbridge, the central district of Oppara, stretches 8,134 feet across the river and ends at the Grandbridge Vagabond Camp on the southern shore. It is a cantilever bridge set atop enormous stone piles sunk deep into the Porthmos. The rest of the span is made of magically strengthened dawnsilver steel, forged in Maheto. Its longest arch, at the center of its span, is 150 feet, for ships of all kinds to pass beneath. The span's surface is covered by mosaic tiles on a foundation of thin granite sheets. It took more than 200 years to be built, at enormous cost to the empire.

References

For additional as-yet unincorporated sources about this subject, see the Meta page.