The exchange of territory with Mataró Historical milestone · Argentona, Maresme, Barcelona Image of Argentona, not of the place itself. In 1840 Argentona ceded to Mataró its strip of coast in exchange for mountain lands, an exchange that left the municipality without an outlet to the sea. The operation explains the elongated shape and the inland vocation of the present district. 1840 Photo: Friviere (CC BY-SA 3.0) What to see and do in Argentona