Lake Superior and Baffin Bay
Bering Sea and Gulf of Mexico
Lake Titicaca and Pacific Ocean
North Sea and Irish Sea
Skagerrak and Gulf of Bothnia
Baltic Sea and Sea of Okhotsk
Lake Geneva and English Channel
Bay of Biscay and Alboran Sea
Adriatic Sea and Tyrrhenian Sea
Aegean Sea and Black Sea
Persian Gulf and Red Sea
Arabian Sea and Bay of Bengal
Gulf of Tonkin and Gulf of Thailand
Sulu Sea and Malacca Strait
Timor Sea and Andaman Sea
Arafura Sea and Tasman Sea
Lake Malawi and Lake Victoria
Lake Chad and Bight of Benin