This is the 8255th most frequent Russian word.
марины
The Russian word "марины" refers to "marinas" or "seascapes" (paintings of the sea) depending on the context.
The word "марины" here refers to plural 'marinas', meaning harbor facilities where boats are kept.
Марины часто гуляют вдоль набережной.
The marinas often stroll along the embankment.
In this sentence, "Марины" can refer either to multiple people named Marina or possibly one named Marina in a genitive form.
Я встретил Марины в парке.
I met Marina(s) in the park.
"марины" is used to denote a 'marina' (dock or place for mooring boats), in a genitive form.