The Coastal Cliffs, also known as the Coastal Track, are rock formations off the coast of Sodor in between Suddery and the Sodor Search and Rescue Centre. They were introduced in the ninth series and were absent until Misty Island Rescue.
Once Thomas had to deliver beach supplies to the Seaside Halt and Diesel warned him about "the curse of the cliffs" which meant that he might get lost and never be seen again. However, Thomas plucked up courage and discovered that nothing bad happened and that Diesel was only trying to scare him.
- When they were first introduced in CGI, there was a small, rocky island next to the coastal cliffs. However, since the move to Arc Productions from the seventeenth series, the island has disappeared.