Assertion: sea's depth | /r/HasProperty | about 1,050 feet
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Source sentences:
text: The western extremity of the Mediterranean Sea connects with the Atlantic Ocean by the narrow and shallow channel of the Strait of Gibraltar, which is roughly 8 miles (13 km) wide at its narrowest point; and the depth of the sill, or submarine ridge separating the Atlantic from the Alborán Sea, is about 1,050 feet (320 metres).