Cultural tours are a popular product in Tanzania that is mostly sold as an add-on to enrich main safari tour programs. Most cultural tour sites in mainland Tanzania were developed by the Tanzania Tourist Board (TTB) in conjunction with the Netherlands Development Organisation (SNV), starting with selected villages around Arusha in northern Tanzania and spreading out into other areas. These are traditionally existing villages which have been made accessible to visitors who may have a glimpse of the authentic lifestyle of the more than 120 tribes in rural Tanzania.