On the Indonesian island of Bali, more than 134,000 people have been taken to shelters as authorities warn that Mount Agung, in the island's north, could erupt at any time.
Several airlines in Singapore and Australia said they are preparing for disruptions, but that flights were running normally for now.
People living outside of that zone have also evacuated.
Indonesian officials say tourists are in no danger from Mount Agung, and there are ample attractions outside of the danger zone surrounding the volcano.
Those who have fled are scattered in more than 500 locations across the island famed for its beaches, lush green interior and elegant Hindu culture, taking shelter in temporary camps, sports centers and other public buildings.
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"I don't know where my kids will sleep and all I can do now is pray", said Gusti Gege Astana, 40. Quoted in The Guardian newspaper, associate professor, Scott Bryan, from the Queensland University of Technology said, "The fact that the seismic tremors beneath the volcano are increasing in number, intensity, and the reduction in their depth in the last week or so, is a very good indication that magma is moving up to the surface".
Volcanologists have not been able to predict when exactly volcano will erupt, but the dramatic increase in tremors recently indicates an eruption is imminent.
"An eruption of Mount Agung could impact air travel in the region". Lava spread for several kilometers (miles) and people were also killed by lahars - rivers of water and volcanic debris.
Mount Agung last erupted in 1963, killing almost 1,600 people. "Sirens will sound and tell the community the mountain has erupted".
The mountain, which sits about 70 kilometers northeast of Kuta, is among more than 120 active volcanoes in Indonesia.
The entire population of Ambae is being moved from the path of the "increasingly active" Marano volcano, also known as Lombenben, according to the Pacific nation's government.