Consider the following pairs:

Updated 11 Apr 2026

Contents14
UPSC Prelims GS2013Geography

Consider the following pairs:

Protected Area Physical Region
1. Nokrek Biosphere Reserve Garo Hills
2. Logtak (Loktak) Lake Barail Range
3. Namdapha National Park Dafla Hills

Which of the above pairs is/are correctly matched?

  1. A1 only
  2. B2 and 3 only
  3. C1, 2 and 3
  4. DNone
Show answer

Answer: (A) 1 only

Pair 1 is correct —

Nokrek Biosphere Reserve is located in the Garo Hills of Meghalaya.

It is known for its wild citrus (Citrus indica), considered the ancestor of all citrus species.

Pair 2 is wrong —

Loktak Lake is in Manipur but it is NOT in the Barail Range.

Loktak Lake is the largest freshwater lake in North-East India and is famous for its floating islands (phumdis) and the Keibul Lamjao National Park (the world's only floating national park).

The Barail Range separates Manipur from Nagaland — but the lake itself is in the Manipur valley, not in the Barail Range.

Pair 3 is wrong —

Namdapha National Park is in the Changlang district of Arunachal Pradesh, in the Mishmi Hills — NOT in the Dafla Hills.

Dafla Hills (now called Nyishi Hills) are in a different part of Arunachal Pradesh.

So only pair 1 is correct.

Why this was asked

Northeast India contains multiple hill ranges and protected areas that students often confuse due to similar names and proximity.

The question tests precise geographical knowledge of where specific protected areas are located within the complex hill systems of Northeast India, not just general awareness of these places.

Nokrek Biosphere Reserve

Geography Nokrek Biosphere Reserve Garo Hills

Nokrek Biosphere Reserve: Location & Significance

Must know

Located in Garo Hills of Meghalaya

Home to Citrus indica - ancestor of all citrus species

Good to know

One of India's 18 Biosphere Reserves

Key Features

Nokrek Biosphere Reserve is located in the Garo Hills of Meghalaya and is globally significant for biodiversity conservation. The reserve protects the wild citrus species Citrus indica, which scientists consider the genetic ancestor of all cultivated citrus fruits worldwide.

Established as biosphere reserve in 2009

Part of UNESCO's Man and Biosphere Programme

Covers the Nokrek Peak area in West Garo Hills district

Location Map

Nokrek Reserve sits in the Garo Hills - the western hill range of Meghalaya
Nokrek Reserve sits in the Garo Hills - the western hill range of Meghalaya

Source: UPSC Colorfull notes — Nokrek National Park & Biosphere Reserve- History, Geography ... · upsccolorfullnotes.com

Exam traps

Don't confuse Garo Hills (Meghalaya) with Khasi Hills or Jaintia Hills

Citrus indica is the wild ancestor - not just any citrus variety

It's a Biosphere Reserve, not just a National Park

Loktak Lake Geography

Geography Logtak Loktak Barail Range

Loktak Lake: Correct Location & Features

Must know

Located in Manipur valley, NOT in Barail Range

Largest freshwater lake in Northeast India

Famous for phumdis (floating islands)

Good to know

Houses Keibul Lamjao - world's only floating national park

Geographic Location

Loktak Lake is situated in the Manipur valley in central Manipur state. The Barail Range runs along the Manipur-Nagaland border in the north, but the lake itself lies in the valley plains - not in the hill ranges.

Loktak vs Barail Range

Feature

Loktak Lake

Barail Range

Location

Manipur valley (central plains)

Manipur-Nagaland border (northern hills)

Elevation

Low-lying valley

Hill range

Type

Freshwater lake with phumdis

Mountain range

Districts

Bishnupur, Imphal West

Separates Manipur from Nagaland

Location Context

Map of Manipur showing Loktak Lake in the central valley and Barail Range along northern border with Nagaland

Loktak Lake sits in central valley while Barail Range forms the northern border hills

Exam traps

Trap: Barail Range is in Manipur but the lake is NOT located there

Don't confuse: Valley location vs hill range location

Remember: Largest freshwater lake in Northeast India, not all of India

Namdapha National Park

Geography Namdapha National Park Dafla Hills

Namdapha National Park: Correct Location

Must know

Located in Mishmi Hills, NOT Dafla Hills

Situated in Changlang district of Arunachal Pradesh

Good to know

India's largest national park by area

Only park with all four big cats of India

Geographic Context

Namdapha National Park is located in the Mishmi Hills in Changlang district of Arunachal Pradesh, near the Myanmar border. The Dafla Hills (now called Nyishi Hills) are in a different part of Arunachal Pradesh, mainly in the central region.

Hill Ranges of Arunachal Pradesh

Hill Range

Location in State

Major Protected Areas

Mishmi Hills

Eastern AP (Changlang, Lohit)

Namdapha National Park

Dafla Hills (Nyishi Hills)

Central AP

Various smaller reserves

Aka Hills

Western AP

Eaglenest Wildlife Sanctuary

Patkai Hills

Southeastern AP

Extensions into Nagaland

Location Map

Namdapha lies in eastern Mishmi Hills, not central Dafla Hills
Namdapha lies in eastern Mishmi Hills, not central Dafla Hills

Source: Drishti IAS — Namdapha National Park · www.drishtiias.com

Exam traps

Major trap: Confusing Mishmi Hills (correct) with Dafla Hills (wrong)

Remember: Namdapha is near Myanmar border in eastern AP

Don't mix: Different hill ranges within same state

Northeast India Hill Ranges

Geography Garo Hills Barail Range Dafla Hills

Major Hill Ranges of Northeast India

Must know

Northeast hills are part of Purvachal range system

Each state has distinct hill ranges with different names

Good to know

These ranges separate different valleys and states

State-wise Hill Ranges

State

Major Hill Ranges

Key Features

Meghalaya

Garo Hills, Khasi Hills, Jaintia Hills

Nokrek Biosphere Reserve in Garo Hills

Arunachal Pradesh

Mishmi Hills, Dafla Hills, Aka Hills

Namdapha in Mishmi Hills

Manipur-Nagaland Border

Barail Range

Separates the two states

Mizoram

Mizo Hills, Lushai Hills

Part of Arakan Yoma extension

Assam

Karbi Anglong Hills, North Cachar Hills

Central Assam highlands

Purvachal System

# Northeast Hill Ranges
## Meghalaya Plateau
- Garo Hills
- Khasi Hills
- Jaintia Hills
## Arunachal Ranges
- Mishmi Hills
- Dafla Hills
- Aka Hills
- Patkai Hills
## Border Ranges
- Barail Range
- Naga Hills
- Manipur Hills
## Southern Ranges
- Mizo Hills
- Tripura Hills
Exam traps

Don't assume all hills in a state belong to one range - AP has multiple ranges

Border ranges like Barail separate states but landmarks may be in valleys

Meghalaya has three distinct hill ranges - Garo, Khasi, Jaintia