Natural Heritage of Erra Matti Dibbalu in News

Analysis

Introduction

The Natural Heritage of Erra Matti Dibbalu (Red Sand Hills) located in Visakhapatnam, Andhra Pradesh has been submitted by the Permanent Delegation of India to UNESCO to the Tentative List on 27 August 2025 under Criterion (viii). The site is recognized as a Natural category geo-heritage site reflecting significant coastal geomorphological and paleo-climatic processes.

Location and Physical Characteristics

Erra Matti Dibbalu is situated along the coastal tract near the Bay of Bengal in Visakhapatnam. The site spreads over approximately 1500 acres (~3 sq. km) and is characterized by red sand mounds formed through long-term geological processes.The formations exhibit:

• Dendritic drainage patterns over sand mounds
• Composition of sand, silt, and clay
• Distinct reddish coloration due to oxidation over millennia

These formations were first documented in 1886 by William King (GSI) and initially termed as “badlands”.

Geological Significance

The site represents a unique coastal geomorphological system and acts as a natural archive of Earth’s dynamic processes, particularly during the late Quaternary period.

Key Geological Processes Reflected

• Sea level fluctuations → rise and fall of oceans
• Climatic changes → monsoons, glacial and dry phases
• Erosion and deposition → wind (aeolian) and water (fluvial) action
• Neotectonic activity → shaping landforms

The sediments consist of:

• Lower fluvial deposits
• Upper aeolian sands

Thermoluminescence (TL) dating indicates an age range of approximately 57,000–49,000 years BP, linking the site to late Pleistocene and Holocene evolution.

UNESCO Criterion (viii) Justification

Erra Matti Dibbalu represents:

• A rare example of red sand dune systems in a coastal environment
• A record of Quaternary geological history
• Evidence of glacial and interglacial climatic cycles
• A natural “tide gauge” recording sea-level changes

Globally, only two similar sites exist:

• One in Sri Lanka
• One in Tamil Nadu (Chennai region)

Thus, the site holds high comparative global geological value.

Geomorphological and Scientific Importance

The site exhibits:

• Erosional gullies and sand pipes
• Stratified sediment layers
• Aeolian and fluvio-marine deposits

These features provide critical insights into:

• Post-glacial coastal evolution
• Holocene climatic transitions
• Monsoonal variability

It functions as a natural geological museum, aiding both academic research and public understanding.

Integrity and Threats

Erra Matti Dibbalu is a notified National Geo-heritage Monument (2016) and lies within the Coastal Regulation Zone (CRZ).However, the site faces threats such as:

• Tourism pressure → trampling and garbage
• Film shooting activities → physical degradation
• Need for urgent conservation measures

Comparative Analysis

The site is distinct due to its recent geological formation (20,000–50,000 years) and coastal tropical setting, unlike continental desert systems.

Static Part

UNESCO Tentative List

• Prepared by: UNESCO World Heritage Centre
• Purpose: Identification of sites for future World Heritage nomination
• Function: Ensures transparency, global recognition, and conservation prioritization

Geological Survey of India (GSI)

• Declared Erra Matti Dibbalu as National Geo-heritage Monument in 2016
• Role: Documentation and protection of geological heritage sites in India

Updated - 28 AUG 2025 News Source: UNESCO World Heritage Centre