Earth/Atlantica

Atlantica is the crowded capital city of Earth and the Terran Communion. Built above the ocean between the continents of America and Edura, it is the largest and most populous city on the planet, with 220 million people living within its borders. The tourism sector of the planet's economy largely stems from the city, as it is tethered to its orbital rings and thus easily accessible to new Terran citizens.

Description
Atlantica is a megacity built atop hundreds of artificial islands floating in the northern Atlantic Ocean, after which it is named. Its landscape is dotted with tall, reflective skyscrapers held by the Terran Communion's high institutions, while most of the ground is taken by short, residential arcologies. Cutting through them are large avenues followed by heavily arborized sidewalks, which recreate Earth's natural atmosphere for the city's visitors. From space, Atlantica can be seen divided into three rings; the innermost is the wealthiest and most densely populated, and the outermost is more of a business center with limited housing.