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.
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!
Currently there are no similar looking kanji which exist in the WaniKani learning system