The landing-stage is a freestanding building that must be built within a town's main area. Its prime purpose is to allow ships to dock that usually can't; any ship/boat can dock to a harbour, even if they can't dock to the town's beach. The building can be locked, but boats may still dock.
The land-stagecan only be built when an area has access to a lake. If the area has access to the sea, a Coaster Harbour is required.