How to select a country using yandex api maps?

Question

JavaScript

It is necessary to highlight the region of the country (Belarus) on the Yandex map. It turned out to be implemented through the Regions service, but a little incorrectly - he selected the country and divided it into regions, but I do n’t need division into regions, I need the country as one object. I will be glad for any help! Thanks in advance.

ymaps.regions.load("BY").then(function (result) {
            var regions = result.geoObjects;
            regions.options.set({
                strokeWidth: 2,
                fillColor: 'cccc99',
                strokeColor: 'ccffcc',
                opacity: 0.35,
                hasHint: true
            });
            regionMap.geoObjects.add(regions);
        });

I understand that it is possible to implement the selection as a polygon, but I do not understand where to get the coordinates for its construction.