Lake Louise, Banff (Alberta, Canada)
Since the elves has such a strong connection with the sea that isn't awoken until they arrive on the shores of the west coast of Beleriand, maybe it shouldn't be a giant salt lake? I mean one of the most overwhelming things about the ocean is the way it smells, which has to do with what creatures live in salt water, and the smell would have to play some role in the sea-longing.I'm glad you are here Anastasia!
I listened to an episode of the Shaping of Middle-earth class. Dr Olsen was mentioning the similarity between Helcar and the Mediterranean. Of course, they're not the same. I think though that, although an inland sea, it should be salt water.
It seems we are leaning towards a slightly more northern position? Like around the Black Sea? Perhaps Georgia, or Armenia?