The map is completely flat, so it is ready for heavy development. Boston Region: The Boston region for SimCity 4 is a 1:1 scale map of the greater Boston area in Massachusetts.The map is basically a blank canvas, perfect for creating your own community from scratch. Rina's Ridiculous Rivers: Rina's Ridiculous Rivers region has water, water everywhere, but there are also rolling hills with pre-flattened terraces perfect for building.There is an agricultural area in the north and a bay in the south where Sims can take a cruise or visit remote islands by ferry. A single hydrogen plant powers all three cities. Maxisland Region: The Maxisland region is a fully developed metropolis with three medium-sized cities that are home to an art museum, a casino, a courthouse, and 1.3 million sims.