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Indonesia on brink of losing Lake Toba’s Global Geopark status

Covering an area about the size of Hong Kong, Lake Toba is the world’s largest volcanic lake and one of the deepest lakes globally. UNESCO has granted "a yellow card" to the lake's geopark status, signaling deteriorating environmental standards. 

Apriadi Gunawan (The Jakarta Post)
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Medan, North Sumatra
Thu, July 24, 2025 Published on Jul. 23, 2025 Published on 2025-07-23T18:19:37+07:00

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The picturesque Lake Toba, as seen from Samosir Island in North Sumatra. The picturesque Lake Toba, as seen from Samosir Island in North Sumatra. (Shutterstock)

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NESCO assessors have begun the revalidation process of Lake Toba in North Sumatra, as local authorities strive to maintain the site’s Global Geopark status following a “yellow card” warning issued in 2023.

Azizul Kholis, General Manager of the Toba Caldera Global Geopark Management, said the revalidation process aims to ensure that Lake Toba Geopark meets UNESCO’s standards.

“The assessment will span five days, from Monday to Friday. UNESCO assessors José Brilha from Portugal and Jeon Yong Mun from South Korea will visit key sites across several regencies around Lake Toba,” he said on Monday.

“While they won’t cover all 16 geosites in Lake Toba, the assessors will focus on representative areas showcasing the region’s geology, biology and cultural heritage,” he added.

Covering more than 1,145 square kilometers and reaching depths of up to 450 meters, Lake Toba is the world’s largest volcanic crater lake and one of the deepest lakes globally. It is also the largest lake in Southeast Asia, renowned for its stunning natural beauty and the prominent Samosir Island situated at its center. 

The body of water was created by a super-volcanic eruption some 74,000 years ago, the impacts of which reached Africa and Europe. The eruption is believed to have been the largest in the past 2 million years.

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UNESCO granted Global Geopark status to the Toba Caldera in 2020, following a nine-year effort by the Indonesian government. 

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Indonesia on brink of losing Lake Toba’s Global Geopark status

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