What does a red dot on a minecraft map mean?

Question

Title about says it all.

I built a map on minecraft. It has a red dot on it. My guess is that it means there's a bunch of lava at that spot. could it mean anything else?

Answer

It's really anything that is the majority of the blocks in the chunk shown, and is considered red by the maps. Here is a video to help explain it:

. Its in't red wool because that is considered white since it share the same data value as all the other wools. Lava, Netherbrick, TNT are detected as red. Bricks might turn out red also. If it isn't an area you have interacted with yet, I would have to say lava.

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