| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|---|---|---|---|
| Afghanistan | April 3, 2007 | |||
| Bangladesh | December 8, 1985 | |||
| Bhutan | December 8, 1985 | |||
| India | December 8, 1985 | |||
| Maldives | December 8, 1985 | |||
| Nepal | December 8, 1985 | |||
| Pakistan | December 8, 1985 | |||
| Sri Lanka | December 8, 1985 |