When comparing the locations of the regions mentioned, it's essential to consider their geographical contexts and tectonic settings related to tsunami risks.
1. **Himalayas**: This region is primarily a mountain range formed by the tectonic collision of the Indian and Eurasian plates. Tsunamis are generally not associated with mountainous regions that are far from oceanic bodies.
2. **Interior South America**: This area is mostly landlocked and does not have direct contact with the ocean. Tsunamis, which are giant ocean waves typically caused by underwater earthquakes, would not occur here.
3. **Interior Asia**: Similar to interior South America, this region is also landlocked and not near any ocean. Therefore, tsunamis are not a risk in this area.
4. **Japan**: Japan is situated along the Pacific Ring of Fire, a region with significant tectonic activity, including earthquakes and volcanic eruptions. It is surrounded by oceans, making it highly susceptible to tsunamis resulting from underwater seismic events.
Based on this comparison, the statement that best identifies a region where tsunamis are possible is **Japan**.