"it is adjacent to" is a correct and usable phrase in both spoken and written English.
You can use it to describe the close proximity of two things, as in: "The park is adjacent to a busy highway."
The P1′ side chain sterically blocks the His 64 imidazole from adopting the outward χ1 = −60° rotamer, constraining it toward its observed position where it is adjacent to Ala 32 and adjacent to the anion site.
It is adjacent to Marina Bay which is just to its north.
In addition, where a vowel is nasalized because it is adjacent to a nasal consonant, it often retains its nasalization in related forms where the consonant is no longer nasal.
It is adjacent to an abandoned trolley.
It is adjacent to Darayya.
(It is adjacent to Clinton's current office).
It is adjacent to a basement "pub" room.
It is adjacent to the North Sea port of Blyth.
It is adjacent to the already protected Glacier and Waterton parks.
It is adjacent to one owned by her former longtime partner, Alessandro Moruzzi.
It is adjacent to the Carson National Forest and is a three-hour drive north of Albuquerque.
