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Western interior seaway

large inland sea during the mid- to late Cretaceous and the very early Paleogene; split North America into Laramidia and Appalachia; stretched from the Gulf of Mexico to the Arctic Ocean; at its largest, it was 760 m deep, 970 km wide, 3200 km long

Pronunciation
/ˈwɛstərn ˌɪnˈtɪriər ˈsiˌweɪ/
/ˈwɛstən ɪnˈtɪərɪə ˈsiːweɪ/
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