west forms the boundary between Catalonia (comarca of Terra Alta) and Aragon (comarca of Matarraña). The second river, Estrets, is to the west and is a tributary of the river Algars. The river Canaletes, to the north, later joins the largest river in Spain, the Ebro. Climate Horta de Sant Joan has an Interior Mediterranean climate, with very cold winters and extremely hot summers. The area benefits from the Ports Mountain range, which traps cooler sea air from the coast and brings a natural form of "air conditioning" in the evenings in the summer called the Garbi for the winds from the east by that name. Economy With the natural park surrounding it, Horta's economy is mainly based around agriculture, with tourism also being a factor in the economy. Notable people Gerard Badía (born 18 October 1989), Spanish footballer References External links Pàgina web de l'Ajuntament Government data pages Municipalities in Terra Alta (comarca)