Which prefix would be used to describe something that is situated below?

The prefix that indicates something situated below is "Sub-." This prefix originates from Latin, meaning "under" or "beneath." It is commonly used in various terms across different fields, such as "submarine" (beneath the sea) and "substandard" (below the accepted standard). By using this prefix, one can clearly convey the idea of position in relation to something being lower or underneath.

Other prefixes like "Supra-" mean "above" or "over," "Peri-" refers to something that is around or surrounding, and "Meta-" generally indicates a change or transformation. These distinctions clarify why "Sub-" is the appropriate prefix for describing something that is situated below, underscoring its specific meaning compared to the alternatives.