Gilimanuk is a large town and lies on the tip of a peninsula that borders the Bali Barat National Park in west Bali. It is an important port town for the ferry that connects Bali and Java. Gilimanuk Bay (Teluk Gilimanuk) is about two kilometer across and very shallow, less than 10 meter deep with an average of 4 to 5 meter. There are two small islands inside of the bay: Pulau Kalong (the name means flying fox - these are large fruit bats) and Pulau Burung (Bird Island). These islands are actually barely more than sandbars. The bay and it's surrounding mangrove areas are a nursing ground for fish, the water is fed by upwellings brought by the daily tidal changes from the Bali Strait that are rich with plankton but cold.