Tsunami of the Great Deep

You call upon one of the most destructive forces of nature: a tsunami of unbelievable size and power to decimate anything along it's path. The area can be up to 3000 feet long, up to 80 feet wide, and up to 2000 feet tall. The tsunami travels at 1000 feet per round on water and 200 feet per round when colliding with land. Each creature that comes in contact with the spell must make a Constitution saving throw. On a failed save, a creature takes 30d8 +100 bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and is knocked  prone. The tsunami deals double damage to objects and structures. When the spell ends,  water spreads out in all directions, extinguishing non-magical flames within 500 feet of wherever it travelled.