The country of Vietnam is often divided into two regions, the North and the South. The north has a strong Chinese influence as it was under occupation by China for over 1,000 years. In Vietnam, customs such as house-worship and ancestor worship are reserved for annual observances only, so Vietnamese folk culture in Vietnam today remains strongly vernacular. The south is heavily influenced by Vietnamese culture with much fewer vestiges of Chinese cultural influence like calligraphy or traditional Vietnamese clothing worn at celebrations where Han outfits have replaced the old classical dress.