St. Mary's Island

St. Mary's Island is a small group of four uninhabited islands off the coast of Malabar Coast near Malpe in Udupi district, Karnataka, India. Famous for its distinctive hexagonal and columnar basalt formations, the island has attracted geologists, tourists, and naturalists, connecting to broader topics such as Deccan Traps, Gondwana, Indian Plate tectonics and the geological history of the Indian subcontinent. Administratively part of Udupi district, the islands lie close to the port town of Malpe Harbour and the pilgrimage city of Udupi.

Geography and Geology

The islands are situated in the Arabian Sea off the Malabar Coast near Malpe and are composed predominantly of columnar basalt linked to the Deccan Traps, a major flood basalt province. The hexagonal columns have been compared to structures at Giant's Causeway in County Antrim and Fingal's Cave on Staffa, reflecting processes associated with rapid cooling of lava flows during the late Cretaceous to early Paleogene when the Indian Plate separated from Madagascar and moved toward Eurasia. Plate tectonics involving the Réunion hotspot and the breakup of Gondwana contributed to the emplacement of these basalts. The topography is low-lying, with rocky promontories, tide-swept shores, and sandy stretches near Malpe Beach. Seasonal monsoon influences from the Southwest Monsoon drive coastal erosion and sediment transport, interacting with nearshore currents shaped by the Laccadive Sea.

History

Local maritime history connects the islands to the long coastal traditions of the Malabar Coast, which saw interactions among Vasco da Gama's voyages, Portuguese India, Dutch East India Company, and later British Raj maritime routes. Early cartographers included the strip in charts used by traders from Arabian Peninsula ports and Persian Gulf merchants. Colonial-era maps and travel narratives by European explorers often noted the peculiar rock formations, while later Indian geological surveys by the Geological Survey of India documented the basalt columns and linked them to the larger Deccan Traps research. In the 20th century, the region around Udupi developed as a fishing and pilgrimage hub connected to Sri Krishna Matha, influencing access to the islands via Malpe Harbour fisheries. Post-independence policies by the Government of India and the Government of Karnataka recognized the islands as a local natural attraction, bringing infrastructure from nearby Udupi district towns.

Ecology and Wildlife

The islands host coastal and marine ecosystems typical of the Laccadive Sea littoral zone, with rocky intertidal communities, algal assemblages, and pelagic species offshore. Flora includes salt-tolerant coastal species similar to those on the Konkan Coast and Canara (region) shorelines, while fauna encompasses seabirds, crustaceans, and reef-associated fish common to Arabian Sea waters. Notable avifauna visiting the islands may be compared to species recorded at nearby coastal sites such as Kodi Bengre and Kaup Beach; migratory paths link to broader flyways that include Chilka Lake and Bhitarkanika National Park. Marine biodiversity around the islands shares affinities with coastal ecosystems studied in Gulf of Mannar and Lakshadweep; reef fishes, cephalopods, and echinoderms utilize nearshore habitats. Anthropogenic pressures from tourism and regional fisheries affect nesting and foraging, paralleling conservation concerns seen at Netrani Island and St. Marys Islands (Mangalore)-adjacent waters.

Tourism and Recreation

Accessible by short boat rides from Malpe harbour, the islands are popular day-trip destinations for visitors from Udupi, Mangalore, Bengaluru, and tourists arriving via Dabolim Airport-linked itineraries. Activities include sightseeing of the columnar basalts, photography, tidepool exploration, and nearby sport-fishing expeditions linked to Malpe Beach operators. The islands feature in regional tourism circuits alongside attractions such as Udupi Sri Krishna Temple, Maravanthe Beach, Karkala, and St. Lawrence Shrine (Karkala). Seasonal constraints apply during the Southwest Monsoon when navigation is restricted by rough seas maintained by the Indian Coast Guard and local pilotage services. Local boat operators and district tourism initiatives sometimes coordinate guided visits, echoing practices used for other Indian coastal islets like Netrani and Gaveshana excursions.

Conservation and Management

Conservation concerns reflect the need to protect geological features and fragile coastal habitats, drawing parallels with management frameworks used at Marine Protected Areas such as Gulf of Mannar Marine National Park and policy instruments developed by the Ministry of Environment, Forest and Climate Change and the Karnataka Forest Department. Measures include visitor regulation, signage, and restrictions during sensitive periods to reduce trampling, littering, and disturbance to intertidal species, modeled after community-based approaches in Pichavaram and Rameswaram. Scientific monitoring by institutions like the Geological Survey of India and regional universities can inform adaptive management, while collaboration with local stakeholders in Udupi district—including fishers from Malpe and civic bodies—supports enforcement and sustainable tourism. Integration with state-level coastal zone regulations such as those implemented under national coastal policies aims to balance heritage protection with recreation and local livelihoods.

Category:Islands of Karnataka Category:Geology of India Category:Tourist attractions in Udupi district