The Seagull Lake is sub-coastal saline lake fed by a marine spring located in the locality of Yanerbie on the western side of the Eyre Peninsula in South Australia within the boundaries of the Sceale Bay Conservation Park.] It lies about 20 kilometres south of Streaky Bay and 280 kilometres north of Port Lincoln.
The 88-hectare sub-coastal lake was reported in 2010 as being dominated by Zostera and Ruppia marine seagrasses. There are grassed sand-dunes on the west between the lake and the bay. On the east the lake is bordered by about a kilometre of whipstick mallee and paperbarks, before a series of ephemeral saline wetlands. The surrounds retain much native vegetation, especially samphire and halophytic shrubland. The threatened Beaded Samphire and West Coast Mintbush are found at the lake. Although some parts are permanently wet, much of the lake bed dries up during droughts.
