Ethiopia:

Cush, which is generally rendered Ethiopia, is applied in Scripture to at least three distinct and different countries.

1. The country watered by the Gihon or Araxes ("And the nameª of the secondª riverª [is] Gihon:ª the same¹ [is] it that compassethª°¹ the whole¹ landª of Ethiopia.ª" {Gen 2:13}), also called Cuth, "And the men²¹ of Babylonª madeª°¹ Succothbenoth,ª and the men²¹ of Cuthª madeª°¹ Nergal,ª and the men²¹ of Hamathª madeª°¹ Ashima,ª" {2Kg 17:30}.
2. A country of Arabia Petrea, bordering upon Egypt, which extended from the northern extremity of the Red sea along its eastern shore. (Compare "Now Mosesª keptªª°°¹ the flockª of Jethroª his father in law,ª° the priestª of Midian:ª and he ledª°¹ the flockª to the backsideª of the desert,ª and cameª° to¹ the mountainª of God,ª [even] to Horeb.ª" {Exd 3:1} with "And Miriamª and Aaronª spakeª° against Mosesª because¹¹ of² the Ethiopianª womanª whom¹ he had married:ª° for¹ he had marriedª° an Ethiopianª woman.ª" {Num 12:1} and "I sawª° the tentsª of Cushanª in¹ affliction:ª [and] the curtainsª of the landª of Midianª did tremble.ª°" {Hab 3:7}).
3. Ethiopia Proper, an extensive country of Africa, comprehending Nubia and Abyssinia; being bounded on the north by Egypt, on the east by the Red Sea and Indian Ocean, and on the south and west by various nations of Africa, and extending from about 6 degrees to 24 degrees n lat. and 25 degrees to 45 degrees e long. It is probable that it was this latter Cush, or Ethiopia, of which Tirhakah was king; he being in league with his kinsman Sevechus, son of So, or Sabacon, king of Egypt, against Sennacherib, the king of Assyria.