Internal water

From shore to the base line which is the low water line-or outer most
harbor construction or straight baselines connecting outer most islands in the case of archipelagos.

If vessel enters voluntarily within the jurisdiction of the coastal state. Foreign flag vessels have the right of innocent passage in internal waters only when:

1. Baselines, which have been redrawn, now enclose waters
previously seaward of the base line and were territorial sea Force majeure- distress War ships immune if entered with consent Merchant vessels in internal waters port state has civil as well as criminal jurisdiction.

Port state may, however, have a tendency not to exercise jurisdiction
unless: offence affects peace custom, immigration offence port state citizen involved breach of pollution, navigation, pilotage rules master of vessel request.