The Apollo's belt, also known as Adonis belt or iliac furrow, is a term for a part of the human anatomy. It refers to two shallow grooves of the surface anatomy of the human abdomen running from the iliac crest (hip bone) to the pubis.
The term "iliac furrow" does not appear in any of the abstracts indexed by PubMed. It is not a currently defined term in Terminologia Anatomica, though it has been used as a formal anatomical term in the past. In modern usage, it is more common to discuss the surface anatomy in terms of nearby structures such as the inguinal ligament or iliac crest.
The term "iliac furrow" is still often encountered when reading about art history, and the term "Apollo's belt" is often used by bodybuilders and their admirers. The expression "Adonis belt" is also encountered, though less common, from the sense of Adonis as any handsome young man (cf. the myth of Adonis).