|Native name||Pärnu laht|
|Ocean/sea sources||Gulf of Riga, Baltic Sea|
|Surface area||400 km2 (150 sq mi)|
|Max. depth||12 m (39 ft)|
|Shore length1||140 km (87 mi)|
|1 Shore length is not a well-defined measure.|
It has an area of 411 km². The maximum depth in the mouth of the bay is 12 m. The banks are low-lying, sandy in some places. The salinity of the water in the bay is 0-0,8 ppm in the spring and up to 5.5 ppm in autumn.
There are several rivers flowing into the gulf, the largest is the Pärnu River.
The bay is also Estonia's most important coastal fishing area.