The Ultimatum takes place in different locations depending on the season:

• Season 1 was filmed in Austin, Texas, primarily at the Austin Marriott Downtown and the Aloft Austin Downtown Hotel

• Season 2 took place in Charlotte, North Carolina, with couples mostly from North and South Carolina. Filming included various local spots in Charlotte

• Season 3 was filmed in the Scottsdale and Downtown Phoenix area in Arizona. The cast lived in luxury apartments such as the AVE Phoenix Terra apartments in Downtown Phoenix, featuring scenic city and mountain views

So, the specific location depends on which season of The Ultimatum you are referring to.