BORDER AREA DEVELOPMENT PROGRAMME (BADP) (Nodal Department)
Border Area Development Programme was introduced in Sikkim from the year 1998-99 to meet the special problems faced by the people living in the border areas. This is a 100% Centrally Funded Area Programme provided as Special Central Assistance based on the length of international border, population of border blocks and area of border blocks.
The Country wise length on international borders of Sikkim area as follows:-
| a) | Boundary with Bhutan | 30.90 km |
| b) | Boundary with Tibet (China) | 220.35km |
| c) | Boundary with Nepal | 07.80 km |
| Total length of International Borders | 349.05 km |
The programme is implemented in Sikkim in 17 Border blocks i.e. 8 blocks on Bhutan border, 4 blocks on China border and 5 blocks on Nepal border. The total population covered in these 17 blocks is 27739 as per 2001 census.
The 17 border blocks with details of district-wise blocks are as follows:-
| Sl. No | Block East | Population as per 2001 Census | Distance of the village / habitation from the international border (km) | Name of Bordering Country | Remarks |
| 1 | Dalapchen | 2027 | 11 | Bhutan | Separated by a small stretch of Forest Area |
| 2 | Changeylakha | 717 | 9 | ||
| 3 | South Regu | 687 | 7.5 | ||
| 4 | North Regu | 1148 | 4.5 | ||
| 5 | Prem Lakha | 71 | 4.5 | ||
| 6 | Subani Dara | 1378 | 4.5 | ||
| 7 | Singaneybas | 52 | 4 | ||
| 8 | Phadamchen | 1024 | 4.5 | ||
| 9 | Gnathang | 6241 | 6 | China | |
| Total | 13345 | ||||
| North | |||||
| 10 | Lachen | 2923 | 37 | China | These are the last habitated areas in North District bordering China. Between these Blocks and the international boundary lies the mountain, desert and snow covered areas. During summer the people of these areas take their cattles for grazing upto the proximity of the border area and return during the winter season. |
| 11 | Lachung | 2800 | 12 | ||
| 12 | Chungthang | 3766 | 195 | ||
| Total | 9489 | ||||
| West | |||||
| 13 | Maneybong | 2710 | 6 | Nepal | Separated by a small stretch of forest area. |
