Which city did Inklings found after winning the Great Turf War?

The city the Inklings founded after winning the Great Turf War is Inkopolis.

Inkopolis is the central urban setting of the original Splatoon and remains a major cultural hub in the series. After the Inklings defeated the Octarians in the Great Turf War, they established a modern society above ground, with Inkopolis becoming its best-known city. The setting blends shopping districts, battle arenas, fashion stores, music, and the central plaza where players access many activities.

The city is closely tied to the Great Zapfish, whose power supports Inkopolis. In the first game’s story, the Octarians steal the Zapfish, sending Agent 3 through Octo Valley to recover it. That campaign is separate from the city itself, which is the main multiplayer and social hub.

Splatsville is the major city associated with Splatoon 3, while Octo Valley is a campaign region and Alterna is an underground setting. Those names are related to the world but are not the answer to this question.