Tombelaine, Tidal island in Mont Saint-Michel Bay, France
Tombelaine is a rocky island in Mont Saint-Michel Bay that rises about 45 meters above sea level. It stretches roughly 250 meters in length and displays granite outcrops with ancient geological formations.
English forces established a military outpost here starting in 1423 during the Hundred Years War as part of their operations in the bay. The island served as a strategic point in their broader campaign along the Norman coast.
The name comes from Celtic words meaning 'little mountain' because it stands smaller next to its famous neighbor across the bay. Local fishermen and travelers have long known this island as a distinctive landmark that marks the edge of one of France's most remarkable coastal areas.
Getting to the island requires understanding how the tides work, since water levels rise and fall dramatically throughout the day. It is strongly recommended to hire a local guide who knows the bay well and can ensure you cross safely and arrive at the right time.
The French government purchased the island in 1933 and officially protected it as a historic monument four years later. What many visitors do not realize is that it later became a bird sanctuary, making it an important refuge for seabirds and shorebirds in the region.
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