The most popular available tourist destinations in Myanmar include big cities such as Yangon and Mandalay; religious sites in Mon State, Pindaya, Bago and Hpa-An; nature trails in Inle Lake, Kengtung, Putao, Pyin Oo Lwin; ancient cities such as Bagan and Mrauk-U; as well as beaches in Nabule, Ngapali, Ngwe-Saung, Mergui. Nevertheless, much of the country is off-limits to tourists, and interactions between foreigners and the people of Myanmar, particularly in the border regions, are subject to police scrutiny. They are not to discuss politics with foreigners, under penalty of imprisonment and, in 2001, the Myanmar Tourism Promotion Board issued an order for local officials to protect tourists and limit "unnecessary contact" between foreigners and ordinary Burmese people.