The ports of Tornio and ► Lulea lie onÂ—for 10 pointsÂ—what northern extension of the Baltic Sea that separates Sweden from Finland?
This body of water is internally divided by regions of sills called the "Northern Quark" and "Southern Quark." 17th-century botanist Elias Tillandz supposedly became so seasick while crossing this body of water that he journeyed hundreds of miles around its shores on foot to avoid the return crossing. Far northern parts of this body of water are known for low (*) salinity, which allows species like the freshwater mussel Anodonta to thrive. The ports of Tornio and ► Lulea lie onÂ—for 10 pointsÂ—what northern extension of the Baltic Sea that separates Sweden from Finland?
This body of water is internally divided by regions of sills called the "Northern Quark" and "Southern Quark.
Gulf of Bothnia (prompt on "Baltic Sea" before "Aland")