Bay of Bengal

The Bay of Bengal forms the northeastern part of the Indian Ocean, located between the Indian subcontinent and the Indochinese peninsula, south of the Bengal region. It covers a huge area of 2,600,000 km², and is bordered by many countries in South Asia and Southeast Asia.

Geopolitically, the bay is bound by mainland India on the west and northwest, Bangladesh in the north, Myanmar in the northeast, and the Andaman and Nicobar Islands of India in the east. Its southern edge is marked by a line between Sangaman Kanda in Sri Lanka and the northwesternmost point of Sumatra in Indonesia.

Many major rivers such as the Ganges, Brahmaputra, Irrawaddy, Godavari, Krishna, Mahanadi, and Kaveri flow into the Bay of Bengal. The coastline includes beautiful beaches like Cox's Bazar and Marina, as well as important natural areas such as the Sundarbans, the largest mangrove forest in the world.

Background

The Bay of Bengal is a large part of the Indian Ocean, located between the Indian subcontinent and the Indochinese peninsula. It covers an area of 2,600,000 km² (1,000,000 sq mi). The bay is bordered by India to the west and northwest, Bangladesh to the north, Myanmar to the northeast, and the Andaman and Nicobar Islands of India to the east.

The bay gets its name from the historical Bengal region, which today includes modern-day Bangladesh and the Indian states of West Bengal, Tripura, and the Barak Valley of Southern Assam. Ancient Romans called it "Sinus Gangeticus" or "Gangeticus Sinus," while Ancient Greeks referred to it as "Κόλπος Γαγγητικός," meaning "Gulf of the Ganges."

Significance

Economic importance

See also: Countries of the Bay of Bengal

The Bay of Bengal has been important for trade for a long time. One of the first trading groups was the British East India Company, with Gopalpur-on-Sea as one of their main trading spots. Other trading groups included the English East India Company and the French East India Company.

Today, the BIMSTEC helps countries around the Bay of Bengal, such as Bangladesh, Bhutan, India, Myanmar, Nepal, Sri Lanka, and Thailand, trade with each other more easily.

Fishermen along the Bay of Bengal use special boats called thoni and catamarans. They catch many kinds of fish, about two million tons each year, and many of the world's fishermen live and work there.

Geostrategic importance

See also: Eastern South Asia

The Bay of Bengal is very important because it connects many countries in South and Southeast Asia. It helps countries like India, Bangladesh, and Myanmar work together, especially to keep the seas safe.

Big ports like Chittagong, Kolkata, and Chennai are along its coast, making it a key place for trade and travel. Countries such as China, India, and Bangladesh work with others to support safety and trade in the area.

Religious importance

For many people, a special place called Swargadwar in Puri is very important. It is considered a holy spot by Hindus. Every day, people there honor the sea with prayers and a special ceremony called the Samudra arati.

Key features

The Bay of Bengal has many beautiful beaches, several important channels, and many islands including the Andaman Islands and Nicobar Islands of India. Some islands, like the Cheduba group near Myanmar, have mud volcanoes that sometimes burst.

Many large rivers such as the Ganga, Brahmaputra River, Mahanadi, Godavari, Krishna, and Kaveri Rivers flow into the Bay of Bengal. These rivers carry huge amounts of dirt and plant material into the bay every year, creating rich land areas called deltas.

The bay is also home to many busy seaports. In India, important ports include Paradip Port, Kolkata Port, and Chennai Port. In Bangladesh, key ports are Chittagong and Mongla. Myanmar has the port of Akyab (Sittwe).

Oceanography

Geology

Lithosphere and plate tectonics

The lithosphere of the Earth is broken up into pieces called tectonic plates. The Bay of Bengal is part of the Indo-Australian Plate, which is slowly moving northeast. This plate meets the Burma Microplate at the Sunda Trench. The Nicobar Islands and the Andaman Islands belong to the Burma Microplate. The India Plate moves under the Burma Plate at the Sunda Trench. This movement creates pressure and heat, forming volcanoes like those in Myanmar and a volcanic arc called the Sunda Arc. The Sumatra-Andaman earthquake and Asian tsunami happened when pressure in this area caused a big underwater earthquake, leading to a harmful tsunami.

Marine geology

A narrow strip of sea bottom, 50 meters wide, runs from Sri Lanka and the Coromandel coast to the Bay of Bengal’s head, then south through the Andaman and Nicobar islands. Beyond this is a deeper area. The Swatch of No Ground is a deep sea canyon in the Bay of Bengal, with the deepest point about 1,340 meters. It is part of the Bengal Fan, the world’s largest underwater fan.

Submarine fans

A submarine fan, also called an abyssal fan, is a big underwater shape formed by rivers carrying sediment to the deep sea. The Bay of Bengal’s fan, called the Bengal Fan or Ganges Fan, is the largest in the world. It stretches about 3,000 kilometers long and 1,430 kilometers wide, with a thickness of up to 16.5 kilometers. It formed from sediment carried by the Himalayas and Tibetan Plateau through rivers like the Ganges and Brahmaputra. These sediments travel through underwater valleys to the Bay of Bengal. The fan covers most of the Bay’s floor and is bordered by slopes and trenches.

Oceanographic chemistry

Coastal areas around the Bay of Bengal are rich in minerals. Places like Sri Lanka, called Ratna – Dweepa meaning Gem Island, have many valuable stones such as amethyst, beryl, ruby, sapphire, topaz, and garnet. Studies show that changes in ocean chemistry are affecting shell strength in sea creatures.

Oceanographic climate

From January to October, water in the Bay moves north in a pattern called the "East Indian Current". In May and June, the Bay of Bengal monsoon hits the Nicobar and Andaman Islands, then moves to mainland India by late June. From September to December, the water moves south in a pattern called the East Indian Winter Jet. This time of year often brings strong storms that can affect eastern India.

Marine biology, flora and fauna

The Bay of Bengal has many different plants and animals, including coral reefs, places where fish lay eggs, and mangroves. It is one of the world’s largest marine ecosystems. The Bay is home to sea snakes like Kerilia jerdonii, beautiful shells such as the Glory of Bengal cone (Conus bengalensis), and many fish and dolphins. Important places for animals include the Gahirmatha Marine Wildlife Sanctuary in Odisha, where olive ridley sea turtles come to lay eggs, and the Sundarbans, home to the royal Bengal tiger.

Transboundary issues

The eight countries around the Bay of Bengal work together to solve shared environmental problems. They focus on three main areas: protecting fish and ocean life, keeping the water clean, and preparing for strong storms.

Fish in the Bay of Bengal are important for many people, but fishing too much can harm the fish and other sea creatures. Countries need to work together to manage fishing and protect habitats like mangroves and coral reefs.

Pollution from cities and factories can make the water unsafe. This includes waste, chemicals, and plastic that can travel between countries. Strong storms, called cyclones, also affect the region and can cause big waves and flooding.