This is the 16948th most frequent Russian word.
сопредельная
"Сопредельная" means "adjacent" or "neighboring."
The word 'сопредельные' is used as an adjective describing 'государства' (states), indicating proximity or adjacency to Russia.
Россия имеет сопредельные государства с различной культурой.
Russia has neighboring countries with diverse cultures.
Here, 'сопредельной' functions as an adjective agreeing with 'территории' (territory), expressing being adjacent to the national park.
Этот заповедник расположен на сопредельной территории с национальным парком.
This wildlife sanctuary is located in an adjacent area to the national park.
In this example, 'сопредельный' describes 'район' (district), emphasizing its geographic or administrative adjacency to the city.