There are a lot, in my brief examination around the map last night looking for good places to fly the Albatross.
Now that said, the developer of the Albatross says Asobo has finally added a much-requested feature to let you start from ANY body of water in the sim by selecting it as departure location and selecting “On the ground” from the options. I haven’t had a chance to test this yet but I’m am VERY excited for this!