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Which one among the following islands in South-East Asia is situated b

June 1, 2025 by rawan239

Which one among the following islands in South-East Asia is situated between Wallace’s Line and Weber’s Line that are related to Bio-diversity ?

Borneo

Celebes (Sulawesi)

Java

New Guinea

This question was previously asked in

UPSC Geoscientist – 2024

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Celebes (Sulawesi) is an island situated in Wallacea, the biogeographical transition zone between Wallace’s Line and Weber’s Line in Southeast Asia.

Wallace’s Line is a faunal boundary line drawn in 1859 by Alfred Russel Wallace that separates the biogeographical realms of Asia and Wallacea, a transitional zone. It passes through the Indonesian archipelago. Weber’s Line, proposed by Max Carl Wilhelm Weber, runs slightly east of Wallace’s Line and is considered the boundary where the fauna is approximately 50% Asian and 50% Australian in origin. The islands situated between these two lines are part of Wallacea.

Borneo and Java lie west of Wallace’s Line and belong to the Asian faunal region. New Guinea lies east of Weber’s Line and belongs to the Australasian faunal region. Celebes (Sulawesi) is one of the largest islands entirely within Wallacea, the zone between the two lines.

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