In the beginning of 1500 Vicente Yáñez Pinzon was blown off course by a storm and reached what is now the north east coast of Brazil on 26 January 1500, exploring as far south as the present-day state of Pernambuco. His fleet was the first to fully enter the Amazon River estuary which he named "Río Santa María de la Mar Dulce" ("Saint Mary's River of the Freshwater Sea"). However, the land was too far east for the Castilians to claim under the Treaty of Tordesillas, but the discovery created Castilian ("Spanish") interest, with a second voyage by Pinzon in 1508 (an expedition that coasted the northern coast to the Central American coastal mainland, in search of a passage to the East) and a voyage in 1515–16 by a navigator of the 1508 expedition, Juan Díaz de Solís. The 1515–16 expedition was spurred on by reports of Portuguese exploration of the region (see below). It ended when de Solís and some of his crew disappeared when exploring a River Plate river in a boat, but what it found re-ignited Spanish interest, and colonization began in 1531.