True Belon oysters are produced in the area around the French river Belon, and some say that they are some of the rarest oysters in the world. They have a flavor reminiscent of brine and an intense copper finish, and they are full of umami.
These oysters are flat and round, with rippled green shells. However, in the 1950s, scientists brought these oysters to the Unites States of America, Maine in particular, where they are sold in a quantity of only 5,000 oysters per year.