From Longman Dictionary of Contemporary Englishsomebody’s stamping groundsomebody’s stamping groundPLACEa favourite place where someone often goes → stamping ground
Examples from the Corpus
somebody’s stamping ground• A party conference is a natural stamping ground for those who have barely four days in which to make a mark.• It's my guess he is trying to reach his old stamping ground.• Like Banquo's ghost her figure would be seen haunting her old stamping ground.• This raises the question: where is the natural stamping ground for experienced lawyers with case management skills? 