How to save data of thousands upon thousands of different tiles and objects?

Hello, so i am not a newbie but not a pro either (Anglish veri gud tu). Also this is my first ask post so dont be mad if i posted it in wrong place.

I am planning to make a survival adventure sandbox game in top-down view (think Don't Starve) and i want to know the solution before starting.

So basically i want to generate a random world using several different perlin noises on a tile map. That is not hard but the thing is I want to save and load said worlds. I want these worlds containing thousands upon thousands of tiles and objects to be saved and then loaded again in the future.

Now i understand saving/loading to some extent. I know how to save/load inventory, position etc...

But saving thousand different tile and objects each with unique data and then load their data AND position back... Well i am lost.

Can you help me?