**3. Conclusions**

This Special Issue contributes to a better understanding of the types of IWs in the East Asian marginal seas. We paid particular attention to descriptions of the processes that underly the generation, propagation, and/or acoustic impacts of different IWs. However, further aspects of regional IWs remain poorly understood, including specific details on the generation, propagation, evolution, breaking, and dissipation of NIWs, ITs, continuumfrequency waves, and ISWs/NLIWs.

Continuing to advance the scientific knowledge of regional IWs will aid researchers and environmental managers in addressing many local and global concerns, including issues related to climate, biogeochemistry, biological productivity, marine engineering, submarine navigation, and underwater acoustics. We hope that this Special Issue will be of interest to researchers in these fields, and to those scientists who are continuing to work on the impacts of IWs in the East Asian Seas.

**Author Contributions:** Writing—original draft preparation, S.N.; writing—review and editing, S.N. and X.C. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was a part of the project titled 'Deep Water Circulation and Material Cycling in the East Sea (20160040)' and 'Construction of Ocean Research Station and their Application Studies', funded by the Ministry of Oceans and Fisheries, Republic of Korea. This work is supported by the National Research Foundation (NRF), funded by the Korean Ministry of Education (NRF-2019R1A2C2085461).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
