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The northern border of Sundaland is more difficult to define in bathymetric terms; a phytogeographic transition at approximately 9ºN is considered to be the northern boundary. [4] Greater portions of Sundaland were most recently exposed during the last glacial period from approximately 110,000 to 12,000 years ago.
The same steep undersea gradients that mark the eastern boundary of Sundaland are identified biogeographically by the Wallace Line, identified by Alfred Russel Wallace, which marks the eastern boundary of Asia's land mammal fauna, and is the boundary between the Indomalayan and Australasian realms.
The Sunda plate is a minor tectonic plate straddling the equator in the Eastern Hemisphere on which the majority of Southeast Asia is located. [1]The Sunda plate was formerly considered a part of the Eurasian plate, but the GPS measurements have confirmed its independent movement at 10 mm/yr eastward relative to Eurasia.
"Sunda" also denotes continental shelves or landmasses. Indonesia itself has two shelves: the Sunda Shelf in the west and the Sahul/Arafuru Shelf in the east. Other terms associated with "Sunda" include the Sunda Island Arc or the arc of Sunda Islands, Sunda Fold or tectonic folding in the Natuna Sea, the Sunda Trench, and Sundaland. [1]
"Sunda" denotes the continental shelves or landmasses: the Sunda Shelf in the west and the Sahul/Arafuru Shelf in the east. Other terms associated with "Sunda" include the Sunda Island Arc or the arc of Sunda Islands, Sunda Fold or tectonic folding in the Natuna Sea, the Sunda Trench, and Sundaland.
This reflects the sequence of accretionary wedge formation along the western side of the Philippine Mobile Belt. The youngest western ophiolitic zone was formed in the Sundaland – Philippine Mobile Belt boundary, while the older eastern ophiolite was formed in the proto-Philippine Plate and is the basal rock of the Philippine Mobile Belt. [31 ...
Malesia is a botanical province which straddles the boundary between Indomalaya and Australasia. It includes the Malay Peninsula and the western Indonesian islands (known as Sundaland), the Philippines, the eastern Indonesian islands, and New Guinea.
The Sunda Trench, earlier known as and sometimes still indicated as the Java Trench, [1] is an oceanic trench located in the Indian Ocean near Sumatra, formed where the Australian-Capricorn plates subduct under a part of the Eurasian plate.