Genshin Impact features a variety of local specialties that can only be found in their respective regions. In Natlan, you can find the Brilliant Chrysanthemum, a bright red flower that grows around shallow bodies of water. Here are all the places where you can find them in the game.
Natlan All 71 Brilliant Chrysanthemum Locations Guide 【Genshin Impact 5.0】
Most of the Brilliant Chrysanthemums are clustered around the Stadium of the Sacred Flame. When farming in this area, I recommend using the Teleport Waypoint on the right and then circling the river path, where all the Brilliant Chrysanthemums are clustered.
You can also find a few Brilliant Chrysanthemums in Huitztli Hill. Use the main Teleport Waypoint in the area to reach all the flowers near water sources.
There are only around 71 Brilliant Chrysanthemums in the overworld. If you find that this number is not enough for you, it is possible to farm in a friend's world via Co-op mode. It is worth noting that they must have unlocked the areas above and allow you to farm as well.