Tsunami

You can create, from any body of water large enough, a massive animated wave that will travel in any direction you wish.

The Lore of the Gods
Book One: The Greek Gods  
Lead Designers Steven Creech and Kevin Ruesch Lead Editor Steven Schend Creative Director Jim Butler
Art Director Todd Morasch Artwork Aaron D. Siddal

Transmutation [Water]

Level: Cleric 5, Druid 5, Sorcerer/Wizard 5
Components: V, S, M
Casting Time: 1 action
Range: Long (400ft. +40ft./ level)
Area: 10ft. cube/ level
Duration: 1 round/ 2 levels
Saving Throw: Reflex half
Spell Resistance: No

The wave can smash into structures, topple small sailing vessels, or pummel creatures. When used against a target, the wave causes 1d4 points of damage per caster level.

However, for every 10ft of dry land the wave crosses, it loses one die of damage.

Small creatures are carried along the path of the wave and Medium/Large sized creatures are carried along half the distance. The wave travels at a movement rate of 90ft./ round.