** Eunectes murinus, the green anaconda, the largest species, is found east of the Andes in Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, Brazil and on the island of Trinidad.

** Eunectes notaeus, the yellow anaconda, a smaller species, is found in eastern Bolivia, southern Brazil, Paraguay and northeastern Argentina.

** Eunectes deschauenseei, the dark-spotted anaconda, is a rare species found in northeastern Brazil and coastal French Guiana.

** Eunectes beniensis, the Bolivian anaconda, the most recently defined species, is found in the Departments of Beni and Pando in Bolivia.

** Tarski's theorem: For every infinite set A, there is a bijective map between the sets A and A × A.

** The Cartesian product of any family of nonempty sets is nonempty.

** König's theorem: Colloquially, the sum of a sequence of cardinals is strictly less than the product of a sequence of larger cardinals.

** Hausdorff maximal principle: In any partially ordered set, every totally ordered subset is contained in a maximal totally ordered subset.

** For every non-empty set S there is a binary operation defined on S that makes it a group.

** Tychonoff's theorem stating that every product of compact topological spaces is compact.

** In the product topology, the closure of a product of subsets is equal to the product of the closures.

** If S is a set of sentences of first-order logic and B is a consistent subset of S, then B is included in a set that is maximal among consistent subsets of S. The special case where S is the set of all first-order sentences in a given signature is weaker, equivalent to the Boolean prime ideal theorem ; see the section " Weaker forms " below.

** Any union of countably many countable sets is itself countable.

** If the set A is infinite, then there exists an injection from the natural numbers N to A ( see Dedekind infinite ).

** Every infinite game in which is a Borel subset of Baire space is determined.

** The Vitali theorem on the existence of non-measurable sets which states that there is a subset of the real numbers that is not Lebesgue measurable.

** The Lebesgue measure of a countable disjoint union of measurable sets is equal to the sum of the measures of the individual sets.

** The Nielsen – Schreier theorem, that every subgroup of a free group is free.

** WIB is observed in islands of Sumatra, Java, provinces of West Kalimantan and Central Kalimantan

** WIT is observed in provinces of Maluku, North Maluku, Papua and West Papua.

** OMG particle, an ultra-high-energy cosmic ray observed on the evening of 15 October 1991

** The family observed pots and pans being thrown around the kitchen, blinds moving up and down, lights going on and off, doors locking themselves, chairs flying across the room, and cupboard doors opening and banging shut before being ripped off their hinges among other phenomena.

** Emission spectrum observed in light

** Absorption spectrum observed in light

** ANZAC day is observed for the first time in Australia.

** A supernova, now designated as SN 1572, is first observed in the constellation Cassiopeia by Cornelius Gemma.

** The 100th anniversary of the end of the American Civil War is observed.

** The followers of the Harmonic Convergence claim it was observed around the world.

** Subject-object problem, the issue of how actors or observers relate to things that are observed or acted upon

** Apparent magnitude, the apparent brightness of a celestial object as observed from Earth

** The polar night jets in most models are inclined poleward with height, in noticeable contrast to an equatorward inclination of the observed jet.

** Richard Feynman in his talk at the First Conference on the Physics of Computation, held at MIT in May, observed that it appeared to be impossible in general to simulate an evolution of a quantum system on a classical computer in an efficient way.

** Again, routinely observed in children, the equivalent of doodling without writing.

** Until 2006, the portions of Indiana within the Eastern Time Zone observed Eastern Standard Time year-round – except that five counties near Cincinnati and Louisville customarily observed Eastern Daylight Time despite legally being on Eastern Standard Time.

** Central Daylight Time, observed in the Central Time Zone ( North America )

** Pleocytosis is observed in 46 %, elevated protein in 26 %, and VZV DNA in 22 %.

** Emission spectrum observed in light

** Absorption spectrum observed in light

** Reinhold's Principle of Consciousness-The thinking subject distinguishes, in his / her consciousness, the representation or mental image from both the observing subject and the observed object.

** Two distinct bomb-tube explosions were observed in the downtown area of Azzano Decimo.

** Lagoa das sete cidades on Azores islands ( Portugal )

** The Islands, an unrecognized sub-region includes all of the whisky-producing islands ( but excludes Islay ): Arran, Jura, Mull, Orkney and Skye — with their respective distilleries: Arran, Isle of Jura, Tobermory, Highland Park and Scapa, and Talisker.

** The British Indian Ocean Territory is created, consisting of Chagos Archipelago, Aldabra, Farquhar and Des Roches islands ( on June 23, 1976 Aldabra, Farquhar and Des Roches are returned to the Seychelles ).

** The Dutch try to gain control of all the nutmeg-producing spice islands with the retreat of the English from Ai to Pula Run Island.

** Izanagi and Izanami-no-Mikoto in Japanese mythology, who churned the ocean with a spear, creating the islands of Japan

** Lyngør, a cluster of offshore islands which have been described as the ' Skagerrak Venice ' and proclaimed by the European Commission to be “ Europe ’ s best preserved village .”

** António Elísio Capelo Pires Veloso – 18 December 1974 ( three days before the formal granting of autonomy ), actually the last of many governors ( since 1753, before both islands were separate ), staying on until it became an independent republic on 12 July 1975

** The American Mediterranean Sea ( the Caribbean Sea and Gulf of Mexico ) basin includes most of the U. S. interior between the Appalachian and Rocky Mountains, a small part of the Canadian provinces of Alberta and Saskatchewan, eastern Central America, the islands of the Caribbean and the Gulf, and a small part of northern South America.

** Glacial features: Sandstone buttes that were former islands in Glacial Lake Wisconsin and the former lake bed

** Sigave and Alo on the islands of Futuna and Alofi signed a treaty establishing a French protectorate on 16 February 1888 until annexed in 1917.

** Tidal island-Often small islands ( not necessarily always islets ) which lie off the mainland of an area, being connected to it in low tide and isolated in high tide.

** Ait or eyot-A term for river islands that occur within the River Thames in England.

** Other islands ( Ven )

** other neighbouring territories temporarily under the order were: the cities of Smyrna ( now Izmir ; 1344 – 1402 ), Attaleia ( now Antalya ; 1361 – 1373 and Halicarnassos ( now Bodrum ; 1412-14 ..), all three in Anatolia ; the Greek Isthmus city of Corinth ( 1397 – 1404 )), the city of Salona ( ancient Amphissa ; 1407 – 1410 ) and the islands of Ikaria ( 1424 – 1521 ) and Kos ( 1215-1522 ), all now in Greece

** Chatham Indian Reserve No. 4, an Indian Reserve on those islands

** Admiralty Islands, group of 18 islands including:

** Wallis Island, one of the islands of Wallis and Futuna

** Christinus marmoratus, ( widespread: southern mainland, northwest interior, islands )

** Low-cost infrastructure elements that can increase the speed and reliability of bus service in lanes shared with general traffic include Bus bulbs, boarding islands, and curb realignments.

** as warship ( fitted imperial seal on bow ) — Island, islands, ancient battlefield

** List of islands of Canada

** Athenian naval counter-attacks along coast of Peloponese and islands.

** Diplomacy and skirmishes in Thrace, the islands, and the Northeast.