This is the 13336th most frequent Russian word.
мыса
"Мыса" is the genitive singular or nominative plural form of "мыс," which means "cape" (a point of land extending into water).
In this sentence, 'мыса' refers to a cape, a geographical feature, and is in the genitive singular form.
Мыса обозревали с высоты утёса.
The cape was observed from the height of the cliff.
Here, 'мысов' is the plural genitive form of the word 'мыс', used to describe multiple geographical cape formations.
Карта показывает расположение близлежащих мысов.
The map shows the location of nearby capes.
In this context, 'мысу' is the singular dative form of 'мыс', used to indicate the indirect object of the action.