With every new Genshin Impact update, we get new characters in the game, and to ascend them, we need to farm their ascension materials. One of them is the Spring of the First Dewdrop which is an ascension material required to ascend characters like Navia, and it is already available in the game for you to farm.
As per its in-game description, it is "A limpid drop of dew floating amidst the waters of Morte Region. It is different from other pure water bodies, as though it is a conglomeration of even more pure and primordial Elemental Energy." Since Fontaine is massive, it will be a difficult task to explore a it to farm them, and thus, here are their exact locations to save you a lot of time.
Genshin Impact: Spring of the First Dewdrop Farming Location
Spring of the First Dewdrop is a local specialty of the Fontaine and can be found underwater in Morte Region. You can have a look at its locations marked on the map below as per the Tevyat Interactive Map along with its multi-layered map:
You will need a total of 168 Spring of the First Dewdrop to ascend Navia to her highest level, and as mentioned in the interactive map, you can farm around 61 of them in a single run. After that, you will have to wait for them to respawn to grab the next batch.
You can travel fast from one location to another by using Teleport Waypoints and the Statue of Seven to collect them quickly. In addition to this, make sure that your HP is enough to fight enemies, as you might encounter some while exploring.