The concept of the "smallest region of space possible" is currently an area of active research and exploration in fields such as quantum gravity and Planck-scale physics. According to our current understanding of physics, at extremely small scales near the Planck length (about 1.6 x 10^-35 meters), the conventional description of spacetime breaks down, and a more complete theory of quantum gravity may be needed.
In terms of information, the laws of quantum mechanics suggest that there is a fundamental limit to the amount of information that can be stored in a finite region of space. This limit is known as the Bekenstein bound, which relates the information content to the area of the region under consideration.
Regarding electromagnetic waves, they are described by quantum fields that permeate all of spacetime. These fields can propagate and interact with matter, and their behavior is governed by the laws of quantum electrodynamics (QED). However, it is important to note that the presence of electromagnetic waves does not necessarily imply the existence of infinite information in a given region of space.
In our current understanding, spacetime is considered a dynamic and evolving entity, and electromagnetic waves can travel through spacetime in various directions. The behavior of these waves is determined by factors such as their sources, the properties of the intervening medium, and the geometry of spacetime. The interaction of electromagnetic waves with matter and the observation of their effects are subjects of study in many areas of physics.
It is essential to emphasize that our understanding of the fundamental nature of space, information, and the behavior of electromagnetic waves at extremely small scales is an active area of research, and there is still much to be explored and understood.