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Ōike
is a karst pond on Minamidaitōjima, Okinawa Prefecture, Japan. Ōike is the largest pond containing both freshwater and seawater. It covers , the circumference is , and it is at its deepest point. Fresh water is mixed with seawater beneath. Geology The island is composed of elevated limestone from its atoll. Rainwater has dissolved the limestone leading to a depression in the ground (sinkhole). This has filled with water to become a pond. Natural history On the north of the pond extends an area of wetland with large communities of Bruguera gymnorrhiza, a mangrove plant, which was designated as a Natural monument since it is unique in freshwater on March 18, 1975. Other plants include ''Scirpus tabemaemontani C. C. Gemlin, Panicum repens L. Najas marina'' and ''Vallisneria natans''. Common carp and ''Carassius auratus langsdorfii'' were introduced in 1910 and tilapia in 1955. Birds include mallard, Pacific reef heron, common moorhen and cattle egret.Environmental Agency''T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minamidaitōjima
, also spelt as Minami Daitō or Minami-Daitō, is the largest island in the Daitō Islands group southeast of Okinawa, Japan. It is administered as part of the village of Minamidaitō, Okinawa. Shimajiri District, Okinawa and has a population of 2,107. The island is entirely cultivated for agriculture. The island has no beaches but has a fishing boat harbor and three cargo and ferry ports; as well as an airport Minami Daito Airport (airport code "MMD"). Geography Minamidaitōjima is a relatively isolated coralline island, located approximately south of Kitadaitōjima, the second largest island of the archipelago, and from Naha, Okinawa. As with the other islands in the archipelago, Minamidaitōjima is an uplifted coral atoll with a steep coastal cliff of limestone (the former fringing coral reef of the island), and a depressed center (the former lagoon of the island). The island is roughly oval in shape, with a circumference of about , length of and an area of . The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
