borderingгерундий или причастие настоящего времени Used as a participial adjective meaning "situated on a boundary" or "verging on".
The bordering countries have signed a peace treaty.
Соседние страны подписали мирный договор.
The bordering area is known for its beautiful landscapes.
Прилегающая территория известна своими красивыми пейзажами.
Gerund form of the verb "border" functioning as an uncountable noun for the act or process of adding a border.