Tsunamis occur with the most frequency in the Pacific Ocean and around Indonesia. This is because of the properties of the Pacific Rim; it has a high number of active submarine earthquake zones, which are a major factor in the occurrence of tsunamis. However, it is also possible for tsunamis to occur in other places. The Mediterranean Sea and the Caribbean Sea are also both susceptible to tsunamis.
A tsunami is an incredibly large wave that is caused by underwater volcanic activity or by earthquakes that occur along fault zones underwater. These can cause water levels to rise rapidly and can be incredibly deadly. Tsunamis also do a vast amount of lasting damage to the property and economies of a region. Because of the specific circumstances that lead to the creation of a tsunami, there are certain places that are much more susceptible to these natural disasters than others.
According to the National Oceanic and Atmospheric Association's Center for Tsunami Research, most tsunamis happen in the Pacific Ocean and around the Pacific Rim. This area has enough underwater earthquake activity to cause an increase in the risk of tsunami development. Indonesia is at a high risk for tsunamis for this reason as well.