Three Brothers (islands), Alaska

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The Three Brothers is a small reef located off the north coast of Kodiak Island, Alaska, about 2 km east of Shakmanof Point and 2.5 km west of Ouzinkie. [1] [2]

Reef A bar of rock, sand, coral or similar material, lying beneath the surface of water

A reef is a bar of rock, sand, coral or similar material, lying beneath the surface of water. Many reefs result from abiotic processes, but the best known reefs are the coral reefs of tropical waters developed through biotic processes dominated by corals and coralline algae.

Kodiak Island island in the United States of America

Kodiak Island is a large island on the south coast of the U.S. state of Alaska, separated from the Alaska mainland by the Shelikof Strait. The largest island in the Kodiak Archipelago, Kodiak Island is the second largest island in the United States and the 80th largest island in the world, with an area of 9,311.24 km2 (3,595.09 sq mi), slightly larger than Cyprus. It is 160 km long and in width ranges from 16 to 97 kilometers. Kodiak Island is the namesake for Kodiak Seamount, which lies off the coast at the Aleutian Trench. The largest community on the island is the city of Kodiak, Alaska.

Alaska State of the United States of America

Alaska is a U.S. state in the northwest extremity of North America, just across the Bering Strait from Asia. The Canadian province of British Columbia and territory of Yukon border the state to the east, its most extreme western part is Attu Island, and it has a maritime border with Russia to the west across the Bering Strait. To the north are the Chukchi and Beaufort seas—southern parts of the Arctic Ocean. The Pacific Ocean lies to the south and southwest. It is the largest state in the United States by area and the seventh largest subnational division in the world. In addition, it is the 3rd least populous and the most sparsely populated of the 50 United States; nevertheless, it is by far the most populous territory located mostly north of the 60th parallel in North America: its population—estimated at 738,432 by the United States Census Bureau in 2015— is more than quadruple the combined populations of Northern Canada and Greenland. Approximately half of Alaska's residents live within the Anchorage metropolitan area. Alaska's economy is dominated by the fishing, natural gas, and oil industries, resources which it has in abundance. Military bases and tourism are also a significant part of the economy.

The reef spans about 550 m in the southwest to northeast direction, and some parts of it uncover about 60 cm. Two rocks at the southwest end uncover by about 1.2 m, and one rock at the northeast end uncovers by about 1 m. There is a light on the southwesternmost rock. A kelp forest extends about 250 yards outh of the light toward Low Island. [1] [2]

Centimetre unit of length equal to 1/100 of a metre

A centimetre or centimeter is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of 1/100. The centimetre was the base unit of length in the now deprecated centimetre–gram–second (CGS) system of units.

Lighthouse structure designed to emit light to aid navigation

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and to serve as a navigational aid for maritime pilots at sea or on inland waterways.

Kelp Large brown seaweeds in the order Laminariales

Kelps are large brown algae seaweeds that make up the order Laminariales. There are about 30 different genera.

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  1. 1 2 (2010) Kodiak Island Chapter5 of Coast Pilot 9, edition 29. National Oceanic and Atmospheric Administration.
  2. 1 2 Wikimapia, Three Brothers Reef. Accessed on 2012-07-03.

Coordinates: 57°55′24″N152°33′10″W / 57.9234361°N 152.5528118°W / 57.9234361; -152.5528118

Geographic coordinate system Coordinate system

A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position; alternatively, a geographic position may be expressed in a combined three-dimensional Cartesian vector. A common choice of coordinates is latitude, longitude and elevation. To specify a location on a plane requires a map projection.