Pulau Weh lies at the most north westerly tip of Indonesia, where the Indian Ocean meets the Andaman Sea. The deep water and strong currents that sweep past the island provides perfect conditions for both large and small marine species. The island has active volcanic vents that emit sulphurous gases and lies close to an active subduction zone. Pulau Weh lies just off shore from Banda Aceh, the city that was devastated during the 2004 tsunami. Fortunately, damage on the island was minimal compared to the devestation on the mainland.