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Trinidad and Tobago are the southernmost islands of the Lesser
Antilles, located close to the South American continental shelf
(see fig. 1). Trinidad lies 11 kilometers off the northeast coast
of Venezuela and 130 kilometers south of the Grenadines. It is 60
kilometers long and 80 kilometers at its maximum breadth and
comprises an area of 4,828 square kilometers. Trinidad appears
rectangular in shape with three projecting peninsular corners.
Tobago is located thirty kilometers northeast of Trinidad, from
which it is separated by a channel thirty-seven kilometers wide.
The island is 42 kilometers long and 13 kilometers wide, with a
total area of 300 square kilometers. Tobago is cigar-shaped in
appearance and has a northeast-southwest alignment.
Geologically, the islands are not part of the Antillean arc.
Rather, Trinidad was once part of the South American mainland, and
Tobago is part of a sunken mountain chain related to the continent.
The islands are now separated from the continent of South America
by the Gulf of Paria; a nineteen-kilometer-wide northern passage--
Dragon's Mouths; and a fourteen-kilometer-wide southern passage--
Serpent's Mouth (see fig. 6).
Trinidad is traversed by three distinct mountain ranges that
are a continuation of the Venezuelan coastal cordillera. The
Northern Range, an outlier of the Andes Mountains of Venezuela,
consists of rugged hills that parallel the coast. This range rises
into two peaks. The highest, El Cerro del Aripo, is 940 meters
high; the other, El Tucuche, reaches 936 meters. The Central Range
extends diagonally across the island and is a low-lying range with
swampy areas rising to rolling hills; its maximum elevation is 325
meters. The Caroni Plain, composed of alluvial sediment, extends
southward, separating the Northern Range and Central Range. The
Southern Range consists of a broken line of hills with a maximum
elevation of 305 meters.
There are numerous rivers and streams on the island of
Trinidad; the most significant are the Ortoire River, fifty
kilometers long, which extends eastward into the Atlantic, and the
forty-kilometer-long Caroni River, reaching westward into the Gulf
of Paria. Most of the soils of Trinidad are fertile, with the
exception of the sandy and unstable terrain found in the southern
part of the island.
Tobago is mountainous and dominated by the Main Ridge, which is
29 kilometers long with elevations up to 640 meters. There are
deep, fertile valleys running north and south of the Main Ridge.
The southwestern tip of the island has a coral platform. Although
Tobago is volcanic in origin, there are no active volcanoes.
Forestation covers 43 percent of the island. There are numerous
rivers and streams, but flooding and erosion are less severe than
in Trinidad. The coastline is indented with numerous bays, beaches,
and narrow coastal plains.
Tobago has several small satellite islands. The largest of
these, Little Tobago, is starfish shaped, hilly, and consists of
120 hectares of impenetrable vegetation.
Trinidad and Tobago, well within the tropics, both enjoy a
generally pleasant maritime tropical climate influenced by the
northeast trade winds. In Trinidad the annual mean temperature is
26°C, and the average maximum temperature is 33°C. The
high, particularly during the rainy season, when it averages 85 to
87 percent. The island receives an average of 211 centimeters of
rainfall per year, usually concentrated in the months of June
through December, when brief, intense showers frequently occur.
Precipitation is highest in the Northern Range, which may receive
as much as 381 centimeters. During the dry season, drought plagues
the island's central interior. Tobago's climate is similar to
Trinidad's but slightly cooler. Its rainy season extends from June
to December; the annual rainfall is 250 centimeters. The islands
lie outside the hurricane belt; despite this, Hurricane Flora
damaged Tobago in 1963, and Tropical Storm Alma hit Trinidad in
1974, causing damage before obtaining full strength.
Because it was once part of South America, Trinidad has an
assortment of tropical vegetation and wildlife considerably more
varied than that of most West Indian islands. Tobago has a
generally similar but less varied assortment.
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