The area around the port town of Cassis in Southern France is known for its three narrow inlets (called calanques) which are almost unique to this part of the world. With their steep limestone walls, they make for perfect marinas, and so they have become. The longest of these is Port Miou, which appears on a map as a long blue finger pointing roughly to the northeast. It looks much better for real and from above, as you'll see in this beautiful drone video by contributor nicospolski aerial.
drone video south france