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Tomahawk Lagoon
Tomahawk Lagoon is a twin-lobed lagoon, located at the western end of the Otago Peninsula within the city limits of Dunedin, New Zealand. It lies close to the southeastern edge of the city's main urban area, near the suburb of Ocean Grove, which lies close to its southern shore. This suburb was also known as Tomahawk until the 1930s〔Hamel, A. (2007) ''Dunedin tracks and trails.'' Dunedin: Silver Peaks Press. ISBN 978-0-473-13772-4.〕 The name is not a reference to the weapon, but rather possibly an anglicised form of the Māori words ''tomo haka'', meaning "dance by a gravesite".
The lagoon, which is connected by a short stream to the Pacific Ocean, is noted for its bird life. Despite its name, it is never inundated with the sea, but is more of a shallow coastal lake, predominantly under in depth. The top lagoon (inner lobe) is a wildlife reserve.〔Herd, J. and Griffiths, G.J. (1980) ''Discovering Dunedin.'' Dunedin: John McIndoe. ISBN 0-86868-030-3.〕 Tomahawk Lagoon is separated from the sea at low tide by Tomahawk Beach, which runs east from the Lagoon's mouth for about . A smaller beach, Smaill's Beach, lies further to the east, beyond which is the outcrop of Maori Head, from the lagoon's mouth. A rocky reef and the small Bird Island lie close to the headland. To the west of the lagoon's mouth is the prominent headland of Lawyer's Head, a major Dunedin landmark.
The outer lobe (the Bottom Lagoon) is the larger, being some in length and wide at its widest point. It is roughly a parallelogram in shape, and covers an area of close to . The Top Lagoon joins the Bottom Lagoon via a short stream in the middle of the latter's eastern shore. It is roughly triangular, being in length and in width, and covers an area of some . The total area of the lagoon is thus some .
The total catchment area of the lagoon is .〔()〕 Several small streams flow through the steep valleys which lie to the north and northeast. The largest of these is Lagoon Creek, which flows from near Arthur's Seat for some before feeding the Top Lagoon at its northeastern end. Owing to the pastoral nature of much of the surrounding land, nutrient runoff into the lake is frequently high, resulting in its often eutrophic nature.〔S. F. Mitchell (1974) "Phosphate, Nitrate, and Chloride in a Eutrophic Coastal Lake in New Zealand" ((abstract) )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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