Rotinsel, officially the Free State of the Red Islands (German: Freistaat Rotinsel) is a Free State of the United Reich of New Bayern, located on an island group off the eastern coast of Terra Rossa. Rotinsel was established in 1015 as an Imperial Colony after it was deemed suitable for Neubayerisch colonisation. There was little resistance on the part of the natives to the Neubayerisch colonists, and some tribes openly embraced Neubayerisch rule and modernisation. The settlers, mostly concentrated in the colonial capital of St Martinsburg and the other settlements of New Königstadt, Aurorastadt and Kaiserburg. Another city was built for the natives, Eryrdydd, although in the decades since then multiculturalism has become a feature of Rotinselian cities in general. After the Umstrukturierung program, Rotinsel was transformed into a fully integrated Free State of the Reich.
Rotinsel has a proportionally large young population: approximately 65% of all people living in the Colony are under the age of 18. As such, many schools have been built all across the islands to cater for all the children living on the Colony.
Rotinsel has an ethnic majority of Welsh, who migrated centuries prior to what is now Rotinsel from the Terra Rossian mainland.