Lakshadweep Islands

Lakshadweep is a classic coral archipelago built upon the Lakshadweep-Chagos Ridge, a contiguous submarine mountain range in the Arabian Sea. Geologically, this ridge is a northern extension of the volcanic hotspot track created by the Reunion Hotspot, which also formed the Deccan Traps. The islands themselves are formed by the growth of coral reefs over thousands of years on top of this submerged volcanic basement, aligning with Charles Darwin’s Theory of Coral Atoll Formation through gradual subsidence. Unlike the tectonic and volcanic origin of the Andaman and Nicobar Islands, Lakshadweep is entirely biogenic, composed of calcium carbonate sands and coral debris.

Topographical Configuration

The archipelago is situated between 8°00′ N to 12°30′ N latitude and 71°00′ E to 74°00′ E longitude, roughly 200 to 440 kilometers off the coast of Kerala. It consists of 36 islands, islets, and reefs, covering a total land area of just 32 square kilometers, making it India’s smallest Union Territory. The islands are low-lying, with an average elevation of merely 1 to 2 meters above sea level, rendering them highly vulnerable to sea-level rise. Geomorphologically, most islands feature a shallow, calm lagoon protected by a fringing reef on their western flank, and a steep, storm-beaten beach face on their eastern side.

Detailed Classification of Islands and Sub-Groups

The Amindivi Sub-Cluster

The northernmost group of the archipelago is known as the Amindivi Islands. This cluster is highly susceptible to monsoonal weather patterns.

• Amini: The central and historically significant island of this group, noted for its rich artisan traditions and coir production.
• Chetlat and Kiltan: Small, northern linear islands featuring well-developed reef flats.
• Kadmat: A long, narrow island featuring an expansive, shallow lagoon on its western side, which serves as a major habitat for marine flora.

The Laccadive (Cannanore) Sub-Cluster

The central group comprises the main administrative and economic hubs of the Union Territory.

• Kavaratti: The administrative capital of Lakshadweep. It hosts the headquarters of the Union Territory administration, a prominent desalination plant, and extensive coral lagoons.
• Andrott: The largest island in terms of land area within the entire archipelago. Unlike most other islands in the territory, Andrott lies on an east-west axis and lacks a well-defined western lagoon.
• Agatti: Serves as the primary aviation gateway to the archipelago, hosting the only airstrip in the Union Territory.
• Kalpeni: Notable for its massive storm bank of coral debris on the eastern shore, deposited during a historic cyclone in 1847.

The Minicoy Sub-Cluster

Minicoy (Maliku) forms the southern isolated outpost of the archipelago, separated from the central islands by the Nine Degree Channel.

• Geographical and Cultural Status: It is the second-largest island in the territory. Culturally and linguistically, it differs completely from the northern islands, as the inhabitants speak Mahl (a dialect of Divehi, the language of the Maldives) and follow Maldivian social customs, whereas the northern islands speak a dialect of Malayalam.

Coral Reef Ecosystems and Geomorphological Features

Reef Structures and Atolls

The archipelago consists of 12 atolls, 3 reefs (including Cherbaniani and Byramgore), and 5 submerged banks. The reefs are predominantly fringing and atoll formations, constructed primarily by scleractinian (hard) corals belonging to the genera Acropora, Porites, and Pocillopora.

Calcareous Soil and Lack of Rivers

The soil of Lakshadweep is completely calcareous, formed by the disintegration of coral limestone and shells. Due to the high permeability of this coral sand, there are no rivers, streams, or surface freshwater bodies anywhere in the territory. Inhabitants rely entirely on a thin layer of freshwater lens floating above the denser seawater beneath the islands, which is replenished via rainfall.

Crucial Maritime Channels and Passages

The maritime geography of the Arabian Sea and global trade routing are heavily shaped by the natural passages bisecting the Lakshadweep group:

Strategic, Geopolitical, and Ecological Importance

Maritime Domain Awareness and SLOC Control

Lakshadweep provides India with immense strategic depth in the western Indian Ocean. By straddling the Nine Degree Channel, the islands act as a permanent radar and naval outpost to monitor international Sea Lines of Communication (SLOCs) against piracy, maritime terrorism, and foreign naval incursions. The Indian Navy operates INS Dweeprakshak in Kavaratti and INS Jatayu on Minicoy Island to strengthen security matrix and maritime domain awareness.

Amplification of Exclusive Economic Zone (EEZ)

Despite its minuscule land area, the radial maritime layout of Lakshadweep projects a vast territorial claim over the surrounding waters, contributing approximately 400,000 square kilometers to India’s total Exclusive Economic Zone (EEZ). This maritime expanse is rich in high-value skipjack and yellowfin tuna resources, managed under sustainable pole-and-line fishing practices.

Ecologically Protected Areas

The entire archipelago is classified as an ecologically fragile zone.

• Pitti Island (Bird Sanctuary): An uninhabited, low-lying coral islet that serves as a critical breeding ground for pelagic seabirds, such as the Sooty Tern and the Brown Noddy.
• Marine Biodiversity Conservation: The lagoons host endangered marine species, including the Green Sea Turtle, Hawksbill Turtle, and the Dugong. Marine national parks and community reserves regulate commercial exploitation to protect the reef ecosystem.

Key Facts and Trivia for UPSC Prelims

Historical Nomenclature

Until 1973, the islands were officially known as the Laccadive, Minicoy, and Amindivi Islands. They were consolidated and renamed Lakshadweep (meaning “a hundred thousand islands” in Sanskrit) through a parliamentary act.

Pitti Island Tectonic Anomaly

Pitti Island is an asymmetric sand spit that shifts dynamically in response to the changing direction of the Southwest and Northeast monsoonal currents.

Low-Temperature Thermal Desalination (LTTD)

Due to the acute shortage of natural surface water, India’s National Institute of Ocean Technology (NIOT) set up the world’s first ever commercial LTTD plant at Kavaratti. This technology utilizes the temperature gradient between warm surface seawater and cold deep-sea water to produce clean drinking water.

Coir and Coconut Dominance

Agriculture is restricted to monoculture coconut cultivation. Coconut is the only major crop, and coir twisting (fiber extraction) stands out as the primary traditional state-backed cottage industry alongside sustainable fishing.