"We built the city of Colombo in Cities:Skylines"

check it here: github.com/team-watchdog

... accurate topographical representation of Colombo, built with detailed land use and zoning based on official city development plans and data centered around 2020; over a million virtual citizens, simulating population dynamics that reflect large-scale, real-world demographics and human movement; public transport based on actual route data; and curated visual assets to better match Colombo's unique architectural style

via https://news.ycombinator.com/item?id=41417542

View attached image.