The region where tsunamis are possible is Japan.
Comparison:
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Interior Asia: This region is primarily landlocked and far from any major bodies of water, making it unlikely for tsunamis to occur.
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Interior South America: Similar to interior Asia, this region is also landlocked and does not have a direct connection to oceanic areas prone to tsunamis.
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Himalayas: While this mountain range is prone to earthquakes, which can trigger tsunamis in nearby bodies of water, it is not directly associated with tsunami activity as there are no large oceanic bodies nearby.
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Japan: This country is located on the Pacific Ring of Fire, where tectonic activity is significant, and it is surrounded by the Pacific Ocean. As a result, Japan is highly susceptible to tsunamis resulting from underwater earthquakes.
Therefore, the best answer is Japan as the region where tsunamis are possible.