Mexico has seen immigration from different parts of Asia throughout its history. The first known Asians arrived during the Colonial era as slaves, labourers and adventurers from the Philippines, southern China and India. Smaller numbers of immigrants came from Korea, Ceylon (now Sri Lanka), Indonesia, Cambodia, Japan and the Malay peninsula. This group of immigrants were collectively described as "Chino" meaning Chinese despite coming from many diverse origins. During the early 20th century, a significant number of Asians, primarily Chinese and Korean, were imported as labourers. These immigrants were known as "Henequen" and "Chinetescos" and were heavily concentrated in agricultural plantations in the Pacific states (e.g. Sinaloa) and the Yucatán Peninsula.