The former name for the north coast of South America between the Orinoco River and Panama and adjoining parts of the Caribbean Sea when they were under Spanish control.
美洲大陆加勒比海沿岸（南美西北海岸奥里诺科河与巴拿马之间区域，及加勒比海毗连部分的旧称）
Definition of Spanish Main in US English:
Spanish Main
proper nounˌspænɪʃ ˈmeɪnˌspaniSH ˈmān
The former name for the north coast of South America between the Orinoco River and Panama and adjoining parts of the Caribbean Sea when they were under Spanish control.