From Longman Dictionary of Contemporary Englishthe length and breadth of the area/country/land etcthe length and breadth of the area/country/land etcEVERYWHEREin or through every part of a large area The police searched the length and breadth of the country. → length
Examples from the Corpus
the length and breadth of the area/country/land etc• But the Jaipur is hoping that eventually passengers will be eating their food the length and breadth of the country.• They dogged him the length and breadth of the country, wherever the small troupe of players appeared. 