What area did Columbus change from the gold coast to the rich coast?

Columbus changed the term "Gold Coast" to "Rich Coast" when he arrived in Costa Rica during his fourth voyage in 1502. While the region was initially named for its perceived abundance of gold, Columbus noted the lush landscape and the wealth of Natural Resources, leading him to describe it as a "Rich Coast." This name reflected not just the potential for gold but also the overall fertility and biodiversity of the area.