tunnels and crossing 864 bridges. Himachal has three  domestic airports   at  Shimla,   Bhuntar  ( serving  Kullu  and  Manali  ) and at  Gaggal   (  serving  Kangra  and  Dharamsala  ) . Air routes connect the state with  Chandigarh  and  Delhi . The population density of Himachal Pradesh is 110 per sq km.