The Gulf of Martaban is a part of the Andaman Sea in the southern part of Burma. The gulf is named after the port city of Mottama (formerly known as Martaban). The Salween Sittaung and Yangon rivers flow into it. A characteristic feature of the Gulf of Martaban is that it has a tide-dominated coastline. Tides range between 4–7 m, with the highest tidal range at Elephant Point in the western Gulf of Martaban. During spring tide, when the tidal range is around 6.6 m, the turbid zone covers an area of more than 45,000 km², making it one of the largest perennially turbid zones of the world's oceans. During neap tide (the lowest level of high tide), with a tidal range of 2.98 m, the highly turbid zone coverage drops to 15,000 km². The edge of the highly turbid zone migrates back-and-forth in-sync with every tidal cycle by nearly 150 km. This 300 m image of 4 March 2014 shows the Gulf of Martaban and the various rivers flowing into it. The light-brown haze in the Gulf indicates increased phytoplankton concentrations.