In Halifax, the original town layout influenced where some burial grounds are today. 20,000 people got buried where those red outlines are, just outside the original walls. Today this land is partly still cemetery, partly developed, and partly parkland. In the past there were problems with erosion causing skeletons to pop out of the ground.
Source
(1) is the nice burial area with some elaborate tombstones and monuments while (2) is where you got dumped in a mass grave if you were poor. The end of the yellow lines roughly corresponds to where the shoreline was originally. The rest is fill.