Biomes of Sundaland

During the last ice age the world was dryer and slightly cooler as much of the water was locked up in ice-sheets. Sundaland had a range of biomes, from mountain jungles to swamps and tropical shrub and grasslands.

Here's a vegetation map from WikiPedia of the world during the last ice age. Click the image for a bigger view so you can read the legend.

Two maps from http://atlantisjavasea.blogspot.com/

From a research paper:

Borneo and Indochina are Major Evolutionary Hotspots for Southeast Asian Biodiversity

From Historical distribution of Sundaland’s Dipterocarp rainforests at Quaternary glacial maxima

The results indicate that central Sundaland, exposed because of lower sea levels at glacial maxima, harbored suitable environmental conditions for Dipterocarpaceae and was probably covered by rainforest

This video give you an idea of what the main biome types look like. The most relevant sections are:

10:22 Flooded Grasslands & Savannas

13:39 Tropical & Subtropical Grasslands, Savannas & Shrublands

19:01 Tropical & Subtropical Dry Broadleaf Forests

23:15 Tropical & Subtropical Moist Broadleaf Forests

30:43 Mangroves

34:16 Tropical & Subtropical Coniferous Forests

A look at Earth's biogeographical realms. The Indomalayan realm overview starts at 15:15.

Indonesia topographic map Height map of the region.

https://en.wikipedia.org/wiki/Indomalayan_realm Biogeographic realm

https://en.wikipedia.org/wiki/Australasian_realm Biogeographic realm

https://en.wikipedia.org/wiki/Tropical_and_subtropical_dry_broadleaf_forests

https://en.wikipedia.org/wiki/Tropical_and_subtropical_moist_broadleaf_forests

https://en.wikipedia.org/wiki/Tropical_and_subtropical_grasslands,_savannas,_and_shrublands

https://en.wikipedia.org/wiki/Tropical_and_subtropical_coniferous_forests

https://en.wikipedia.org/wiki/Montane_grasslands_and_shrublands

https://en.wikipedia.org/wiki/Mangrove_forest