How to make unmovable area in 2D platform

I’m start to making a 2D game, like farming and adventure. Now i’m stuck to make unmovable area. Do you have any ideas you can suggest to me?

Please expand what do you mean by unmovable area? A simple scenario of what the player is doing, where he/she doing it and what is about to happen.

I don’t know if you mean unmovable as can’t do anything on this tile (e.g. farm), can’t step on it (e.g. water) or something else.