What is the name of the Martian region where NASA’s Phoenix lander touched down?

NASA’s Phoenix lander touched down in the Martian northern region called Vastitas Borealis.

Phoenix landed on May 25, 2008, at a site in Vastitas Borealis, a broad, low-lying plain surrounding Mars’s north polar region. The area was selected because orbital measurements indicated that water ice could lie close to the surface.

Phoenix’s robotic arm confirmed that prediction by digging into the soil and exposing subsurface water ice. The mission also investigated the region’s soil chemistry, atmospheric conditions, and seasonal environment.

Vastitas Borealis is a geographic region, not the name of the spacecraft’s landing mission or a crater. The landing site is also described using nearby geographic labels and coordinates, which can cause confusion in short references to Phoenix’s destination.