page_title: Borealis Planitia
hierarchical_section_title: Borealis Planitia
caption_attribution_description: English: "This NAC image is of an area just to the north of a previously released image acquired during MESSENGER's third flyby of Mercury. Both that previously released image and this one show large areas of Mercury's surface that appear to have been flooded by lava. In this view, craters are visible that have been nearly filled with lava, leaving only traces of their circular rims. MESSENGER images have revealed that the smooth plains in this region of Mercury's surface are quite extensive, and MESSENGER Science Team members are currently updating maps of the smooth plains created after the mission's second Mercury flyby to include these new views obtained from Mercury flyby 3. After the Mariner 10 mission, there was some controversy concerning the extent to which volcanism had modified Mercury's surface. Now MESSENGER results, including color composite images, evidence for pyroclastic eruptions, and images of vast lava plains (such as shown here) have demonstrated that Mercury was indeed volcanically active in the past."Almost all features in this photograph remain unnamed as of 28 January 2020, but the region is named Borealis Planitia. The photo is centered at about 50° N, 300° W.
context_page_description: Borealis Planitia is a large plain on Mercury with a smooth floor, thought to be similar to a lunar mare. It is centered at 73.4° N, 79.5° W. The name is Latin for "Northern Plain".
context_section_description: Borealis Planitia /bɒriːˈeɪɪs pləˈnɪʃiə/ is a large plain on Mercury with a smooth floor, thought to be similar to a lunar mare. It is centered at 73.4° N, 79.5° W. The name is Latin for "Northern Plain".
caption: Part of Borealis Planitia, photographed by MESSENGER
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