Waterfall Entrance is the first stretch after the plants leave the street east of the house and enter the Maple waterway.
Map dialogue points forward to Maple Falls; damp air, stone paths, and autumn scenery already establish the mood of Maple Mountain.
The water here is calmer than the main falls, but the lawn has already been split by flowing water and the path is beginning to climb.
As the opening of the voyage route, it turns home defense into an expedition: the plants have to adjust to wet ground, waterfall winds, and the first local zombies on the road.