Regasioida

Regasioida is a rare and enigmatic geological formation found primarily in the volcanic regions of Iceland and parts of the Canary Islands. The term derives from the Icelandic words *regin* (meaning "giant" or "elf") and *sóði* (meaning "sink" or "hole"), referencing the formation’s appearance as if carved by mythical beings. These structures are typically shallow depressions or craters formed through a combination of volcanic activity and erosion, often surrounded by basaltic lava fields.

Regasioida formations are characterized by their roughly circular or elliptical shape, usually measuring between 10 to 50 meters in diameter. Their origins are attributed to the collapse of lava tubes or the erosion of phreatomagmatic vents, where steam explosions interact with magma. Over time, wind and water further refine the edges, creating smooth, bowl-like depressions. Some formations may also contain mineral deposits, including silica-rich sinter or travertine, particularly in areas with thermal springs.

While not as widely studied as other volcanic features, regasioida have been documented in regions with significant volcanic history. Their unique appearance makes them notable landmarks, often attracting geologists and tourists alike. The formations are generally stable, though occasional weathering or minor seismic activity can alter their structure. Research into regasioida remains limited, but their study contributes to understanding volcanic processes and the interaction between magma, water, and erosion in basaltic environments.