Pastel—5″ x 5″

The word seiche is pronounced "saysh."
The waves in a seiche are stationary in the horizontal plane and do not progress forward. The waves move up and down, but not forward like wind waves at sea. That's why these waves are called as standing waves rather than progressive waves.
Seiches occur most frequently in enclosed or semi-enclosed basins such as lakes, bays or harbors.