Final answer:
Jamaica is the country that has Portland Bight, with the Jamaica Channel separating it from Haiti. Portland Bight is an ecologically significant embayment on Jamaica's south coast, and the Jamaica Channel forms a geographical divide between Jamaica and Haiti.
Step-by-step explanation:
The country that has Portland Bight and a namesake channel separating it from Haiti is Jamaica. Portland Bight is a large coastal embayment on the south coast of Jamaica, known for its biological diversity and ecological significance. The Jamaica Channel, also referred to as the Jamaica Passage, is the body of water that separates Jamaica from Haiti, part of the Greater Antilles in the Caribbean Sea.
Although the question refers to aerial photographs, mud flats, and a dam, that information does not correspond to the geographical region being asked about, which suggests an error in the provided context. Nonetheless, the key focus is on the Portland Bight and its relation to the geographical separation between Jamaica and Haiti by the Jamaica Channel.