Marias

Marias can refer to multiple things in astronomy, geography, and culture. In astronomy, marias (singular mare) are the large, dark basaltic plains on the Moon's surface. They were formed when ancient volcanic activity flooded large impact basins with lava. The term mare—Latin for "sea"—reflects early observers' impression of seas on the Moon. Most maria lie on the near side and comprise about 16 percent of the lunar surface. Notable examples include Mare Imbrium, Mare Serenitatis, Mare Tranquillitatis, and Oceanus Procellarum. The lighter surrounding highlands form the lunar terrae in contrast to the maria.

In geography, the Marias River is a tributary of the Missouri River in northern Montana, United States. The river's name appears in regional place names and features, such as Marias Pass, and is part of the broader Missouri River watershed.

In culture, The Marias are an American indie pop band formed in Los Angeles in 2016, known for a breezy, retro-inspired sound. The term Marias can also occur as a surname or given name in various languages and may appear in place names or organizational titles.