[GS] Canals don't seem to work

[Melted_Ice]

Hey there!
I built a ship-building area in a lake 4 tiles away from the ocean and for some reason i can't build canals in between the lake and the ocean (even though the city center and pinned areas are all flat). Could someone please figure out why?

 

[Browd]

It looks like you are trying to string together 3 canal district tiles (the ones marked "no tocar"). That can only be done with the Panama Canal wonder. You cannot manually build 3 canal districts in a row. In addition to the flat land requirement, a manually built canal must have either Coast or Lake tile on one side, and either a City Center or another body of water on the other; with the tile configuration in your screenshot, you couldn't manually build a canal district on any of those three tiles.

 

[Melted_Ice]

So i can't build a canal longer than one tile (except panama canal)?
Or could it be a maximum of two (with a canal being one tile and the city center being another)?