The westernmost passage, the Passage Sihlquai, lies to the west of the Sihl, which passes under the station from north to south at the same level as the passageways. Because of the presence of the river channel, the Sihlquai passage has no direct connection to the other passageways, but it connects to streets to the north and south of the station, and to all platforms except that serving tracks 21 and 22.[1]