The data set is novel and important, especially for future investigations in the region and in other seasons. The paper is well written and adequate in length.

The data set consists of CTD data from the Red Sea taken at stations along the Saudi Arabian Coast. In Fig. 2a it is evident that depth profiles were taken. Samples analysed for nutrients and geochemical variables evidently consist only of surface samples. There should be a short note in the methods section about this: It looks like depth profiles were taken by the CTD but sampling was carried out only in surface waters. How deep did the CTD go?

In the data set from the Arabian (Persian) Gulf the question also arises whether CTD data in Figure 10 are from different depths or from different stations. The data set in the repository shows that only three samples from each sampling area were chemically analysed. This should also be noted in the methods to make things clear to the reader/user of the data set.

In general, the data are well presented and discussed with the relevant literature. The presentation of Arabian Gulf data is a bit shorter but adequate.

However, the font in the Figures needs to be enlarged to be able to read the numbers and also the location names. This refers especially to Figures 9, 11 and 12. Some of the other Figures also have slightly small fonts but they are readable. It would be good to adjust all Figures to similar fonts.

Line 641: a reference to the metal data is missing.

The multidisciplinary data set here presented is relevant for environmental assessment. It can be a reference for future investigations and to check for the effectiveness of environmental protection policies. Moreover, it is particularly precious as very few data are available for these two regions. The data set is well documented with a wide description of meta-data and the paper is well organised. Bibliography is exhaustive and complete. Below some suggestions and small amendments.

-In the Introduction add some information about tidal regime in the regions; this also help for a better interpretation of ADCP currents, water column mixing and dispersion.

-Desalinization plants strongly increase local salinity. How wide can be the area affected by this very high salinity?

-Can you report about T and S average values in the open sea of Arabian Gulf, for a better comparison with the coastal observations?

-Show a map with bathymetry

-add a table with the accuracies of the CTD probes sensors

-Tab 1a and 1b -In the first row indicate Date_June 2021

-Tab 1c -Indicate that reported values are the sampling depth

-In addition to TS diagram in Fig.2 also provide 2 figures with vertical profiles of temperature and salinity

Fig.8 right (TPH) use a small-range scale e.g. 0-20 to better enhance the differences between stations