Thousand Islands – Frontenac Arch is one of four ecoregions of the Mixedwood Plains. The Thousand Islands in the Saint Lawrence River have a distinctive flora and fauna and are a part of the biological corridor. The bedrock is mostly gneiss, granite and marble, more than a billion years old. The Frontenac terrain is the youngest of the Ontario portions of the arch, dated at 1.2 billion years old. These rocks were once part of a large mountain chain of the ancient supercontinent of Rodinia. There is also a meteor crater near Holleford, where the shield meets the limestone plains of southeastern Ontario. The area
Thousand Islands (Indonesia) system which also contains the islands of Biawak, Kongsi, Tikus, Burung, and several others. The Kelurahan (administrative Village) of Pulau Tidung (postal code 14520) consists of seven islands. Officially it is listed as having six islands, in which Karang Beras Kecil Island is not included. The Kecamatan (Subdistrict) of Kepulauan Seribu Utara ("North Thousand Islands") is located further north from Jakarta. The sea water is relatively cleaner than the Subdistrict of South Thousand Islands because of its location further away from the Bay of Jakarta. The cleaner water is able to sustain more varieties of marine life. On January 1,