Western Borneo is a wild home to thousand of species orchids. I believe many still yet to discover, but species as Grammatophyllum, Paphiopedillum, Bulbophyllums etc. are hidden inside the rainforest to be discovered.
Travelling to Pontianak, capital of Western Borneo is easy. There are flight from Indonesia major cities such as Jakarta, Jogja, Batam etc. From overseas now there are direct flight from Kuching and Singapore. Just travel to Singapore via Air Asia and then board the domestic Batavia Air from these two cities to Pontianak. If you are a keen orchid collectors, I can help you around (I am a collector as well). Just drop a note in the comments.
Here some photograph of "popular" West Borneo orchid especially the Coelogyne pandurata or "Anggrek Hitam".
Coelogyne pandurata by hon-s4k
his cousin Coelogyne verrucosa
a neat terrestrial Bromheadia finlaysonia is easily found in
Aerides odorata
Cleisostoma subulatum
Cymbidium finlaysonia