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Pitch Lake
The Pitch Lake is the largest natural deposit of asphalt in the world , located at La Brea in southwest Trinidad, within the Siparia Regional Corporation. The lake covers about 40 ha and is reported to be 75 m deep.
Pitch Lake is a tourist attraction that attracts about 20,000 visitors annually. It is also mined for asphalt by Lake Asphalt of Trinidad and Tobago.
==History==
The Pitch Lake has fascinated explorers and scientists, as well as attracting tourists, since its re-discovery by Sir Walter Raleigh in 1595. (The Amerindians knew about and actually showed it to him to help him caulk his boat). Raleigh himself found immediate use for the asphalt to caulk his ship. He referred to the pitch as "most excellent... It melteth not with the sun as the pitch of Norway".〔(La Brea, home of the pitch lake )〕 Since its re-discovery, there have been numerous research investigations into the use and chemical composition of this material. There have been countless theories, postulations, and conclusions as to the size, source, and origin of the asphalt. In 1887, Amzi Barber, an American businessman known as "The Asphalt King", secured a 42-year monopoly concession from the British Government for the Pitch Lake for his company, Barber Asphalt Paving Co. It was from this source that many of the first asphalt roads of New York City, Washington D.C., and other Eastern U.S. cities were paved.
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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