Six Flags Over Texas is a 212-acre (86 ha) theme park located in Arlington, Texas, east of Fort Worth and about 15 miles (24 km) west of Dallas. It was the first Six Flags Theme Park, but because of later acquisitions it is not the oldest park of the Six Flags chain (that particular title is held by Six Flags New England). The park opened on August 5, 1961, following just a year of construction and an initial investment of US$10 million by real estate developer Angus G.