Congratulations
The king raked all the mountains down into flat land so he could see everyone in the kingdom from his castle windows. You should share your congratulations with him. Now, quick tell him this was a great idea.
Imagine saying "Congratulations!" to a king who just ordered his servants to rake down all the pretty mountains in his kingdom.
すい, ずい
みず, しるし
None
The moment you say "Congratulations!" you've already started to miss (みず) those beautiful mountains. But you can't let missing them ruin your congratulations! Don't let the king know!
Imagine how hollow your congratulation sounds when you really miss those mountains. This king doesn't deserve your nice words.