Vanuatu culture retains a strong diversity through local regional variations and through foreign influence. Vanuatu may be divided into three major cultural regions. In the north, wealth is established by how much one can give away, through a grade-taking system. Pigs, particularly those with rounded tusks, are considered a symbol of wealth throughout Vanuatu. In the centre, more traditional Melanesian cultural systems dominate. In the south, a system involving grants of title with associated privileges has developed.