---
title: "Bangladesh Geography, Rivers and Disaster Management"
description: "Study Bangladesh's physical geography, the Ganges-Brahmaputra-Meghna river system, climate vulnerability, and its world-leading disaster-management"
url: "https://modeldiplomat.com/learn/lessons/bcs-bangladesh-affairs-geography-rivers-climate-vulnerability-disaster-management"
---

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Geography, rivers, climate vulnerability & disaster management

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# Geography, rivers, climate vulnerability & disaster management

Bangladesh's physical geography, the Ganges-Brahmaputra-Meghna river system, climate vulnerability and its world-leading disaster-management architecture for the BCS.

## A deltaic nation

Bangladesh occupies the world's largest delta, the Ganges-Brahmaputra-Meghna (GBM) delta, drained by some 700 rivers totalling roughly 24,000 km of waterway. About 80% of the territory is floodplain lying less than 10 metres above sea level; only the Chittagong Hill Tracts (the Keokradong/Saka Haphong massif, the highest points, c. 1,000 m) and the Madhupur and Barind tracts rise above the alluvial plain. The country covers approximately 147,570 sq km, shares a 4,156 km border with India and a 271 km border with Myanmar, and fronts the Bay of Bengal to the south.

## The three great rivers

Three systems define the hydrology. The **Padma** is the name the Ganges takes after entering Bangladesh near Rajshahi. The **Jamuna** is the lower course of the Brahmaputra, which shifted westward into its present channel after the great earthquake of 1762 and floods of 1787. The **Meghna**, fed by the Surma and Kushiyara from the Barak in India's Manipur/Assam, is the deepest. The Ganges and Brahmaputra join at Goalando; the combined flow meets the Meghna near Chandpur before discharging into the Bay—the world's largest combined freshwater discharge after the Amazon and Congo. The delta's seaward fringe holds the **Sundarbans**, the largest mangrove forest on earth (UNESCO World Heritage Site, 1997) and habitat of the Royal Bengal Tiger.

## Transboundary water disputes

Because 57 of Bangladesh's 57 transboundary rivers originate in India and Myanmar, water sharing is a permanent strategic concern. The **Farakka Barrage** (commissioned by India in 1975, 16.5 km above the border) diverts Ganges water into the Hooghly and reduced dry-season flow at Hardinge Bridge, intensifying salinity intrusion and desertification of the southwest. The dispute was settled by the **Ganges Water Sharing Treaty signed 12 December 1996** (Sheikh Hasina–Deve Gowda), a 30-year accord guaranteeing minimum dry-season shares. The **Teesta** river-sharing agreement, initialled in 2011, remains unsigned owing to West Bengal's objections—a recurring current-affairs flashpoint.

## Climate and physiography

Bangladesh has a tropical monsoon climate: pre-monsoon (March–May) bringing nor'westers (kalbaishakhi) and cyclones; the southwest monsoon (June–October) delivering 80% of the c. 2,300 mm annual rainfall; and a dry winter. Sylhet's haors (back-swamp wetlands) and the **flash-flood-prone northeast** contrast with the drought-prone Barind in the northwest. The coastal zone—covering 19 of 64 districts—faces tidal surge, salinity and erosion. This physiographic diversity, concentrated population (over 170 million; one of the highest densities on earth), and low elevation make the country a textbook case of climate exposure.

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