Águas de São Pedro
Recognizing the importance of the thermal springs in the region, the São Paulo State Government on 19 June 1940 founded the (Hydromineral and Climatic Spa of Águas de São Pedro). Despite this, the city celebrates its birthday on 25 July, the date in 1940 of the founding of the first major building in the city, the "Grande Hotel" (now "Grande Hotel São Pedro"). The municipality of Águas de São Pedro was incorporated by State Law No.233, of 24 December 1948.
São Paulo de Olivença
It was founded in 1689 as a mission by Spanish Jesuit Samuel Fritz. The municipality of Santo Antônio do Içá, located to the north, was separated from this municipality in 1955. In 2010, the city suffered from a severe landslide, causing road damage. No one was injured or killed, but many homes were lost in the Amazon River.