A question about custom height maps & landscapes

Hi everyone. This is my first post to these forums so apologies if it’s in the wrong place.

My question is based on creating a height map to create a landscape and to make sure it is the correct size. First, a little background - I want to recreate a wooded area with lake near my home. I intend to use google images to help me to set up the height map in photoshop (location of lake etc).

So my question is how do I make sure that the terrain that is generated from the height map is the correct size? I think it will need to be something the 4km x 4km. Do I need to set the height map image to a certain size/resolution or is this all controlled in UE somewhere? I have already played with it and have searched the forums but can’t find anything to help me.

Thanks in advance :slight_smile: