Chiringashima
Located in Kagoshima Bay about 800 meters offshore near Ibusuki, Chiringashima Island is the largest island in the bay. It is uninhabited, with a circumference of about 3 kilometers, and only 90 meters high.
Between march and October the island becomes connected to the mainland at low tide by a winding sandbar that enables visitors to walk out to the island. The sandbar exists for periods of time up to 4 hours at the longest. I visited in mid-October and wasn't sure if the tide was going out of coming in so didn't risk it.
Because the sandbar connects the two pieces of land and therefore creates a bond it has become known as a power spot for love and matchmaking, one of many such spots that have sprung up around Japan in recent years.
Apparently the island is registered as one of Japan's Top 100 Aromatic Spots..... an obsession with ranking that continues to bemuse me