The Behemoth Grave (巨獣の骨, Kyojū no Hone) is a location in Genso Suikoden Tsumugareshi Hyakunen no Toki.
Located in the southern reaches of the Holy Empire of Ionia, within the Apiro Desert, the Behemoth Grave lies at the former site of Zephtelos Fortress. At some point after the HIY 200 Teras Pharma conflict a sand whale would crash into the fortress, dying, and completely destroying the fortress' remnants. The armorer Gose, upon hearing of this, would travel to the area and used the sand whale's remains to develop a new type of armor enhancement.
By HIY 300, the area was known as the Behemoth Grave with Zephtelos Fortress a long-forgotten memory. The remains of the sand whale provided some cover and protection from the harsh Apiro Desert. As such, scalehorde often camped in the vicinity of the skeletal remains.
- Genso Suikoden Tsumugareshi Hyakunen no Toki The Complete Guide (ISBN 978-4-04-886462-6), page 87