Mount Washu or Washà «-zan () is a 133 meter hill in Shimotsui (), Kurashiki, Japan, but famous traditionally for viewing the Seto Inland Sea dotted with various small islands, and now for commanding the majestic view of the Great Seto Bridge, one of the three bridges connecting Shikoku Island with the main Honshu Island.
On the hill are the visitor center and two observation points. Near the parking lot, now free, stands the stele of a local haiku poet's kyoka, "Shima hitotsu miyage ni hoshii Washà «-zan" (), which means: Mount Washu is the only precious souvenir that I want to bring back home from this trip.
Mount Washu can be reached in fifteen minutes by car from Kojima Station of JR's Honshi-Bisan Line or in ten minutes from Kojima Interchange () of Seto-Chà «à  Expressway.