Spanish Formosa refers to the period when the Spanish Empire established a presence in the region of present-day Taiwan during the 17th century. The Spanish aimed to expand their trade routes and missionary activities in Asia, particularly to spread Christianity among the indigenous populations. They built a fort called San Salvador in 1626, which served as a base for their operations. The Spanish presence in Formosa lasted until 1642 when they were expelled by the Dutch, who had established their own colony on the island. Despite their relatively short rule, the Spanish influence contributed to the cultural and religious landscape of Taiwan, leaving a legacy that can still be seen today.