1. An Asian river that rises in the Altai Mountains in northern China and flows generally northwest to become a tributary of the Ob River
   - Irtish, Irtysh, Irtysh River

Type of: river

Part of: Siberia

• pericentre
• perichondrium
• periclase
• Pericles
• periclinal
• pericope
• pericranium
• periderm
• peridinian
• Peridiniidae
• Peridinium
• peridium
• peridot
• peridotite
• perigee
• periglacial
• perigon
• perigonal
• perigone
• perigonium
• perigynous
• perihelion
• perijove
• peril
• Perilla