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There is likely no optimal keyword density (search engine algorithms have evolved beyond keyword density metrics as a significant ranking factor). It can be useful, however, to note which keywords appear most often on your page and if they reflect the intended topic of your page. More importantly, the keywords on your page should appear within natural sounding and grammatically correct copy.
-> - - 31
-> image - 6
-> stopcovid - 1
-> ---- - 1
-> stop - 1

Your pages having these H1 headigs.
-> ФЕДЕРАЛЬНОЕ АГЕНТСТВОМОРСКОГО И РЕЧНОГО ТРАНСПОРТА

Your pages having these H2 headigs.
-> Новости
-> Инфраструктура водного транспорта
-> Подведомственные организации

Your site doesn't have favicon.

Your site loading time is around 1.8401980400085 seconds and the average loading speed of any website which is 5 seconds required.

Congratulations! Your website does not include flash objects (an outdated technology that was sometimes used to deliver rich multimedia content). Flash content does not work well on mobile devices, and is difficult for crawlers to interpret.

Congratulations! Your webpage does not use frames.