When discussing spatial relationships, the phrase "are adjacent" is commonly used to indicate that two objects or locations are positioned next to one another without any significant distance or obstruction between them. Some useful synonyms for this phrase include "border," "abut," "flank," "neighboring," "adjoining," and "contiguous." Each of these words can be used in a spatial or geographic context to describe the relationship between two objects or locations. Depending on the specific circumstances, one of these synonyms may be more appropriate or precise than "are adjacent," providing greater clarity and specificity in communication.