The transport of upper ocean water from the Pacific to the Indian Ocean through the Indonesian Seas. The throughflow is an important link in the ocean conveyor belt. It is driven by the sea level difference between the Pacific and Indian Oceans and is at its maximum, with 12–20 Sv (12–20 × 106 m3 s−1), during May–September, when it opposes the wind. The minimum, 2–5 Sv, occurs during November–March, when it follows the wind.