What is the position of the E region in the ionosphere?

The ionosphere consists of several distinct layers of ionized gas that are conventionally named D, E, and F, arranged from lowest to highest altitude. Therefore, the E region sits right in the middle, above the D region and below the F region. The F region is the highest and most highly ionized layer, making it the most important for long-distance HF communication. Because the E region is situated below it, signals travelling to the F region must first pass through both the D and E regions. Distractors like 'Above the F region' or 'Below the D region' are physically incorrect because D is the lowest layer and F is the highest. There is also no standard 'C region' used in ionospheric propagation theory.