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Lakshadweep Islands

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Introduction

Lakshadweep, India’s smallest Union Territory by both area (32.69 square kilometers) and population (approximately 65,000), is an archipelago of 36 islands in the Arabian Sea located 200-440 km off the southwestern coast of mainland India (Kerala). The name Lakshadweep, derived from the Sanskrit “Lakshadweepa” meaning “one hundred thousand islands,” is somewhat hyperbolic but captures the cultural and ecological richness of this coral island chain. The islands form the northern segment of the Lakshadweep-Maldives-Chagos archipelago — a 2,500 km chain of atolls, reefs, and banks along the crest of the Chagos-Laccadive Ridge.

Geological Origin — Coral Atoll Formation

Lakshadweep comprises exclusively coral formations — atolls, reef islands, and submerged banks — resting on the Chagos-Laccadive Ridge, a north-south trending submarine ridge composed of volcanic basement rock. This ridge, similar to the Ninety East Ridge in the Bay of Bengal, is believed to represent the trace of the Réunion hotspot that the Indian Plate passed over during its northward drift after the breakup of Gondwanaland. The volcanic seamounts that now form the reef foundations were formed approximately 60-48 million years ago during the late Paleocene to early Eocene.

The coral islands of Lakshadweep are classic examples of Darwinian atoll evolution. Following the subsidence of the volcanic foundations, coral growth kept pace with sea level changes, building vertically upward. The current island morphology — low-lying sand cays resting on annular reefs surrounding central lagoons — formed during the Holocene, as post-glacial sea-level rise slowed approximately 5,000-6,000 years ago and wave action accumulated coral debris and sand into emergent islands.

The islands rarely exceed 2-3 meters above mean sea level, making them exceptionally vulnerable to sea-level rise associated with climate change. The maximum elevation is a modest 5 meters above sea level at some dune crests on Minicoy Island. The subsurface reef platform extends to depths of 1,500-2,000 meters, representing the total Holocene-Miocene reef accumulation on the subsiding volcanic basement.

The Main Island Groups

The inhabited islands — ten in total — are organized into three groups:

The Amindivi Islands (Northern Group): Including Amini (the administrative headquarters for the northern group), Kadmat, Kiltan, and Chetlat. These islands lie closest to the mainland (200-300 km from the Kerala coast) and are characterized by shallower lagoons and a more pronounced southwest monsoon swell. Amini Island features one of the longest beaches in Lakshadweep.

The Laccadive Islands (Central Group): The largest cluster including Kavaratti (the territorial capital, population approximately 12,000), Agatti (with the only airstrip in the islands, 1,292 meters), Andrott (the largest island at 4.90 square kilometers, also the closest to the mainland), Kalpeni, and Bangaram (the only uninhabited island open to tourism). Kavaratti is famous for its calm lagoon, the Ujra Mosque with its ornate wooden ceiling, and the Marine Aquarium that showcases the islands’ tropical fish diversity.

Minicoy Island (Southern Group): The southernmost inhabited island (approximately 200 km south of the Laccadive group), Minicoy (Maliku) is culturally and linguistically distinct — the islanders speak Mahl (or Divehi), related to the language of the Maldives, rather than Malayalam spoken in the northern groups. The island features a distinctive lighthouse (built 1885), one of the oldest in the region. Geographically, Minicoy is separated from the Laccadive group by the Nine Degree Channel (roughly along latitude 9°N), which is analogous to the Ten Degree Channel separating the Andaman and Nicobar groups.

Submerged Banks: Several submerged atolls and banks (Bassas de Pedro, Sesostris Bank, Cora Divh) are part of the Lakshadweep archipelago but have no permanent emergent land. These formations support rich pelagic fisheries.

Climate and Hydrology

Lakshadweep experiences a tropical monsoon climate with high temperatures (25-33°C year-round) and high humidity. Annual rainfall averages 1,600-2,000 mm, predominantly from the southwest monsoon (May-September, contributing approximately 75% of annual precipitation). The islands lie directly in the monsoon wind path, with the southwest monsoon bringing heavy seas that historically rendered inter-island navigation impossible from May to September, a period of traditional isolation.

The islands have no surface water bodies — no rivers, streams, or lakes. Freshwater exists exclusively as a thin freshwater lens floating atop denser seawater within the porous coral sand aquifer. This Ghyben-Herzberg fresh water lens, typically only 0.5-3 meters thick, is entirely dependent on rainfall recharge and is exceptionally vulnerable to over-extraction (which draws up underlying saline water) and contamination. The growing population and expanding tourism have placed this fragile freshwater resource under increasing stress, with most inhabited islands now dependent on desalination plants for potable water.

Marine Biodiversity

The Lakshadweep waters encompass approximately 4,200 square kilometers of lagoon area and 20,000 square kilometers of territorial waters, containing some of India’s most pristine coral reef ecosystems:

  • Coral diversity: Over 100 coral species from 36 genera have been recorded, dominated by massive and branching forms of the genera Acropora, Porites, Pocillopora, and Favia. The reefs suffered severe bleaching during the 1998 and 2010 El Niño events, with mortality rates of 40-80% in certain lagoons, but subsequent recovery has been observed in several areas.
  • Fish diversity: The lagoons and reef slopes support over 600 fish species, including parrotfish, butterflyfish, surgeonfish, groupers, and sharks. The fish biomass in Lakshadweep reefs is among the highest recorded in the Indian Ocean.
  • Marine megafauna: The waters around the islands are important habitats for green and hawksbill sea turtles, spinner and bottlenose dolphins, whale sharks, and manta rays. The seagrass beds (particularly around Agatti and Kalpeni) sustain small dugong populations.

Human Geography and Economy

The population of Lakshadweep is almost entirely Muslim (approximately 96%), with a matrilineal (marumakkathayam) social organization that is unique among Indian Muslim communities — property and family names are transmitted through the female line. The traditional economy rests on three pillars:

  • Coconut cultivation: Coconuts cover approximately 75% of the islands’ land area, with copra (dried coconut kernel) and coir fiber being the main products. The Lakshadweep coconut is renowned for its high oil content.
  • Tuna fishing: The pole-and-line tuna fishery — primarily for skipjack tuna (Katsuwonus pelamis) — is the primary livelihood, employing over 12,000 islanders. The traditional mas-minnows (live baitfish captured from lagoons) used with pole-and-line fishing represents one of the world’s most sustainable tuna harvesting methods.
  • Tourism: Carefully regulated low-volume, high-value tourism operates through resorts on Bangaram, Kadmat, and select uninhabited islets, with visitor numbers limited to protect the fragile island ecosystem. Water sports including scuba diving, snorkeling, kayaking, and deep-sea fishing are the primary tourist attractions.

The islands’ isolation has preserved a unique culture blending South Indian (Malayali and Tamil) influences with Arab maritime trade heritage, reflected in the distinctive architecture (wooden mosques, coral-stone houses), cuisine (tuna and coconut-based), and boat-building traditions (the odam, a sailing craft used for inter-island transport).