the island. The island is fringed by a reef that extends up to 800 m from the shore in the north.

Helen Reef

Helen or Helens Reef (Hotsarihie), about 70 km east of Tobi Island, is a largely submerged atoll, with just one islet (Helen Island). The atoll is 25 km long and nearly 10 km wide, with a lagoon

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