Cannon Points are typically geographic promontories on lakes, rivers, and ocean fronts that were useful for locating cannons that might be a formidable deterrence to any invaders.
Cannons -- Not only for Defense
In times of peace and in remote communities, they were more or less critical points from where cannon shots could be heard throughout the area, to alert the community to important events and news.
There are many such cannon points, all over the world. Some still exist as modern bases for the military powers of the world. Of course, the old cannons have been changed to more modern devices but, when fired, they still produce a sound that’s widely audible.
There’s also a “Cannon Point” near our hideout in the boonies up north. The cannon (if there ever was one – which I’m not sure about) is long gone and the former year-round resident community has dwindled to a small fraction, along with the ports for wooden hull ships that were transporting people and goods up and down the shores. Some communities have disappeared entirely.