Blake Channel

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Blake Channel is a channel in Southeast Alaska, U.S.A. It extends 19.3 kilometres (12.0 mi), separating the southeastern part of Wrangell Island from the mainland. [1] It was first traversed and charted in 1793 by James Johnstone, one of George Vancouver's officers during his 1791-95 expedition. [2]

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Coordinates: 56°18′40″N131°59′20″W / 56.31111°N 131.98889°W / 56.31111; -131.98889

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.