four-cornered
Adjective
Meaning
Having four corners or angles.
Source: Webster's dictionaryExamples
A Tallit (four-cornered prayer shawl) is donned for evening and afternoon prayers–the only day of the year in which this is done.
The former is the Avesta's mythological sea that covers the earth, while Varena is a mythological four-cornered fourteenth region of the world.