adjoin

/əˈdʒɔɪn/

transitive verb

Be next to and joined with (a building, room, or piece of land)

the dining room adjoins a small library

be next to,be adjacent to,border,border on,neighbour,verge on,abut,butt up against,butt up to,bound on,be contiguous with,be connected to,communicate with,link up with,extend as far as,extend to