+----------+
|  Hagnau  | -------+
+----------+        |
  |                 |
  |                 |
  |                 |                     +---------------------+
  |                 |                     |                     |
+----------+      +--------------+      .................     +--------+
| Uhlingen | <--> | Oberuhlingen | <--> : Unteruhlingen : --- | Mainau |
+----------+      +--------------+      :...............:     +--------+