With reference to the Himalayan rivers Joining the Ganga downstream of Prayagraj from West to East, which one of the following sequences is correct ?
Contents10
- AGhaghara - Gomati - Gandak - Kosi
- BGomati - Ghaghara - Gandak - Kosi
- CGhaghara - Gomati - Kosi – Gandak
- DGomati - Ghaghara - Kosi - Gandak
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Answer: (B) Gomati - Ghaghara - Gandak - Kosi
Correct Answer: (b) Gomati → Ghaghara → Gandak → Kosi.
These Himalayan rivers join the Ganga downstream of Prayagraj, from west to east in this order:
- Gomati joins near Varanasi,
- Ghaghara joins at Chhapra,
- Gandak joins at Sonpur (near Patna),
- Kosi joins in Katihar district (Bihar).
Memory trick: 'Go-Gha-Gan-Ko' — Gomati, Ghaghara, Gandak, Kosi — alphabetically almost in order, and geographically west to east.
The Ganga river system drains about 26% of India's total geographical area and supports over 400 million people, making knowledge of its tributary sequence crucial for understanding India's water resources.
UPSC is testing spatial reasoning skills by asking students to visualize the west-to-east sequence of major tributaries downstream of Prayagraj, which requires understanding both Himalayan drainage patterns and Bihar's geography.
Himalayan Tributaries of Ganga
Geography Himalayan rivers Ganga downstream Prayagraj
Himalayan Tributaries of Ganga: West to East Sequence & Confluence Points
Four major Himalayan rivers join Ganga downstream of Prayagraj: Gomati, Ghaghara, Gandak, Kosi
West to East sequence: Go-Gha-Gan-Ko (Gomati → Ghaghara → Gandak → Kosi)
Gomati joins near Varanasi, Ghaghara at Chhapra, Gandak at Sonpur, Kosi in Katihar
All four are perennial rivers originating from the Himalayas
Geographic Context
The Ganga receives major Himalayan tributaries after flowing past Prayagraj (Allahabad). These four rivers - Gomati, Ghaghara, Gandak, and Kosi - join from the left bank (northern side) as the Ganga flows eastward through Uttar Pradesh and Bihar toward the Bay of Bengal.
Confluence Details
River | Confluence Location | State | Key Feature |
|---|---|---|---|
Gomati | Near Varanasi | Uttar Pradesh | Westernmost confluence |
Ghaghara | Chhapra | Bihar | Largest tributary by volume |
Gandak | Sonpur (near Patna) | Bihar | Major flood-prone river |
Kosi | Katihar district | Bihar | Called 'Sorrow of Bihar' |
River Confluence Map
Source: YouTube — Himalayan Rivers PYQ | Ghaghara, Gomati, Gandak, Kosi -Ganga Tributaries Sequence Explained · www.youtube.com
Trap: Confusing the alphabetical order (almost) with geographical order - Go-Gha-Gan-Ko
Trap: Mixing up Gandak and Kosi positions - Gandak joins first at Sonpur, Kosi later at Katihar
Trap: Including Yamuna in the sequence - it joins at Prayagraj itself, not downstream
Trap: Reversing Gomati and Ghaghara - Gomati is westernmost despite being smallest
Ganga River System Overview
Geography Ganga
Ganga River System: Course, Tributaries & Drainage Pattern
Ganga originates from Gangotri Glacier in Uttarakhand, flows 2525 km to Bay of Bengal
Left bank tributaries are Himalayan (perennial), right bank are peninsular (seasonal)
Major left tributaries: Yamuna, Gomati, Ghaghara, Gandak, Kosi
Creates the fertile Indo-Gangetic plain supporting 40% of India's population
Tributary Classification
# Ganga Tributaries
## Left Bank (Himalayan)
- Yamuna
- Gomati
- Ghaghara
- Gandak
- Kosi
## Right Bank (Peninsular)
- Chambal
- Betwa
- Ken
- Son
- DamodarDrainage Characteristics
Antecedent drainage: Ganga system predates Himalayan uplift, cutting through rising mountains
Dendritic pattern: Tree-like network due to uniform rock structure in plains
Seasonal variation: Himalayan tributaries maintain flow year-round, peninsular ones are seasonal
Flood prone: Eastern tributaries (Gandak, Kosi) cause frequent flooding in Bihar
Trap: Confusing left bank (north/Himalayan) with right bank (south/peninsular) tributaries
Trap: Assuming all tributaries are perennial - only Himalayan ones are year-round
Trap: Mixing up Son river - it's a right bank tributary, not left like other major ones
Major Rivers of India
Geography
Major River Systems of India: Classification & Key Features
India has two major river groups: Himalayan (perennial) and Peninsular (seasonal)
Himalayan rivers: Indus, Ganga, Brahmaputra - antecedent and perennial
Peninsular rivers: Godavari, Krishna, Narmada, Tapti - consequent and seasonal
West-flowing: Narmada, Tapti drain into Arabian Sea; East-flowing: most others to Bay of Bengal
River System Comparison
Feature | Himalayan Rivers | Peninsular Rivers |
|---|---|---|
Origin | Glaciers & snowfields | Hills & plateaus |
Flow nature | Perennial (year-round) | Seasonal (monsoon-fed) |
Drainage type | Antecedent | Consequent |
Valley type | Deep gorges, V-shaped | Broad, shallow valleys |
Examples | Ganga, Indus, Brahmaputra | Godavari, Krishna, Narmada |
Age | Older than mountains | Younger, post-geological |
Classification by Drainage
# Indian Rivers
## Arabian Sea
- Indus
- Narmada
- Tapti
- Sabarmati
- Mahi
## Bay of Bengal
- Ganga
- Brahmaputra
- Godavari
- Krishna
- Kaveri
- MahanadiTrap: Assuming all major rivers flow east - Narmada and Tapti flow west to Arabian Sea
Trap: Confusing consequent (peninsular) with antecedent (Himalayan) drainage patterns
Trap: Thinking Brahmaputra flows east-west - it flows south through India after entering from Tibet