adjacent
adjective
nearest in space or position; immediately adjoining without intervening space
“had adjacent rooms”
“in the next room”
having a common boundary or edge; abutting; touching
“Rhode Island has two bordering states; Massachusetts and Connecticut”
“the side of Germany conterminous with France”
near or close to but not necessarily touching
“lands adjacent to the mountains”
“New York and adjacent cities”
Source: WordNet 3.1, Princeton University