Trinidad and Tobago

Relief and drainage

Physiographically, the islands represent an extension of the South American mainland. The outstanding physical feature of the island of Trinidad is its Northern Range, a continuation of the coastal ranges of the Andes Mountains in Venezuela. The range runs east-west at an average elevation of about 1,500 feet (460 metres), rising to 3,084 feet (940 metres) at Mount Aripo (El Cerro del Aripo), the country’s highest peak. The Northern Range is the site of a large number of waterfalls, the most spectacular of which are the Blue Basin Falls and the Maracas Falls, both 298 feet (91 metres) high. On the southern side of the range, foothills with an elevation of approximately 500 feet (150 metres) descend to the Northern Plain.

Running across the centre of the island, from southwest to northeast, is the Central Range, the highest point of which is Mount Tamana (1,009 feet [308 metres]). A third row of mainly low hills, the Southern Range, adds further variety to the mostly flat or undulating surface of Trinidad.

The three mountain ranges determine the island’s drainage pattern. Rivers are numerous but short, the longest being the Ortoire in the south and the Caroni in the north. In low-lying areas swamps can be found; among them are the Caroni Swamp in the northwest and clusters along the eastern (notably the Nariva Swamp) and southern coasts.

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An oil-bearing belt occupies the southern one-fourth of the island, extending west into the Gulf of Paria and east into the Atlantic Ocean. Gas and water seepages give rise to mud volcanoes of various types, the best-known of which is called the Devil’s Woodyard. In the southwest of the island is the deep asphalt deposit known as Pitch Lake.

The island of Tobago is physiographically an extension of the Venezuelan coastal range and the Northern Range of Trinidad. Its dominant feature is the Main Ridge, which runs from northeast to southwest, rising to heights of about 1,800 feet (550 metres). The ridge slopes more gently to the southwest onto a coral plain. The coral formation has given rise to a number of reefs, one of which, Buccoo Coral Reef, is known for its marine life and is popular for scuba diving and snorkeling. Over the years, the reef and its marine life have suffered serious damage from pollution and tourist activity. Tobago has only a few short streams.

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Climate

The climate of Trinidad and Tobago is tropical, with high relative humidity. The coolest months are January and February, when the average minimum temperature is about 68 °F (20 °C). The warmest months are April, May, and October, which have an average maximum temperature of about 89 °F (32 °C). In general, mean temperatures range between 77 °F (25 °C) in February and 85 °F (29 °C) in April. Temperatures vary significantly between day and night, and the climate along the coast is tempered by sea breezes.

There is a main dry season from January to May and a lesser dry season (Petite Carême, or Indian Summer) in September and October. The prevailing winds are the northeast trades. The islands are outside the main hurricane zone, but Tobago occasionally is struck by disastrous hurricanes (e.g., in 1847 and 1963).

Plant and animal life

Vegetation zones are well defined on both islands. In general, the highest areas coincide with the most luxuriant tropical rainforest vegetation. Cultivated estates or small settlements are established in clearings on the hills. In the dry season the hills are dotted with the orange flowers of the mountain immortelle, a large flowering tree that grows to a height of about 80 feet (25 metres), and the flowers of the pink poui and yellow poui trees. Sugarcane, the main agricultural crop, is grown on Trinidad’s Central Plain.

The Caroni Swamp, a bird sanctuary, is frequented by flocks of white flamingos and egrets as well as populations of scarlet ibis—a national bird. Despite its protected status, the sanctuary’s bird population, including that of the scarlet ibis, has declined markedly since the 1970s, the result of illegal hunting and of pollution. The Nariva Swamp, which has a varied bird and mammal population including the manatee, has similarly come under threat despite its protected status, especially from illegal rice farms. The greater bird of paradise was introduced to the island of Little Tobago, a bird sanctuary, but had disappeared by the early 21st century. There are many endangered leatherback sea turtle nesting sites on the islands, the most notable of which is perhaps Matura Beach, on Trinidad.

The forests on both Trinidad and Tobago are hunting grounds for small game, the most-sought-after being the paca, or lappe. Other animals include the agouti (a short-haired, short-eared, rabbitlike rodent), quenck (collared peccary; a wild hog), tattoo (an armadillo), prehensile-tailed porcupine, and iguana. Four main groups of reptiles are present on the islands: snakes, lizards, turtles, and crocodiles (one kind, the caiman, related to the alligators). Trinidad’s other indigenous animals include howler monkeys and ocelots, but the latter have disappeared from the wild and the former are rare. In general, the island’s fauna has come under severe stress from rapid urbanization and industrial development.