Sometimes you want a ship to go where there's no water. Maybe an Oil Refinery is located too far inland for a dock to accept oil, or some mountains are forcing your ships to make large detours.
Either way, a canal is what you need. Canals allow you to place water at any flat tile of land on the map, even if that tile is located above sea level. A lock is used to allow ships to "climb hills": a lock connects two bodies of water at different height levels. Please note that canals and locks are very expensive. Make sure to have enough money before building a canal.
3. Place the cursor on any flat tile of land and then left-click to place the canal tile. You can also click and drag to place longer stretches of canal.
Once the canal is built, it's time to connect it to a lower level of water using locks.
3. Now find a suitable location for the lock. A lock requires two full flat tiles connected by a single slope.
4. Click on the slope to build the lock.
5. Repeat steps 3 and 4 to place more locks if necessary.
This is the end of the Waterways range of tutorials. You now should now everything about using ships in OpenTTD. If you want to learn more about playing OpenTTD, have a look at the list of topics at the upper right corner of this page. Happy OpenTTD'ing!