- A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the drainage divide, made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern.
- Syrma (stars.astro.illinois.edu)
SYRMA (Iota Virginis). Most of the brighter stars of Virgo spread to the northwest of the luminary Spica. The dimmer ones go to the northeast, including our current star Syrma, which from Greek refers to the train of a dress, appropriate to the celestial Maiden of the Zodiac.