The Flats in Amet Sound, off Cape John, are a shallow shoal formation that plays a defining role in the coastal geography of the area. Situated near the eastern entrance of the Sound, The Flats are a broad, submerged sand and gravel shoal that extends outward from Cape John into the sheltered waters of the sound. Their presence has long influenced navigation, as the shoal creates shifting shallows that mariners must account for when entering or leaving the sound.