The huichuaihyao y.ath'o se Yā'mon (Yā'mon belt alpha) is an asteroid belt in the Yā'mon system, Xi'an Empire. Used as a supplier of minerals for the Xi'an military, it was under heavy guard for the duration of the Xi'an-Human Cold War. Human scouts on observation missions were sometimes captured and held as political hostages until they could be exchanged for Xi'an prisoners kept in the United Empire of Earth (UEE).
After the end of the Cold War, the belt was opened to commercial mining, and is one of the main resources of materials for the ongoing terraforming projects on Yethlūl y.ath'o (Yā'mon II) and Yethlūl s.yen'o (Yā'mon III).