evidence: Further south and west, the land slopes to rolling hills and lowlands, and a broad coastal plain. Marked on the map is the Algarve region in the far-south that features mostly rolling plains, a few scattered mountains, and some islands and islets. Its coastline is notable for limestone caves and grottoes. [...] Located at the mouth of the Tabus River, along the coast of the Atlantic Ocean is, Lisbon – the capital and the largest city of Portugal. Lisbon is the westernmost capital city of the European mainland. It is also the administrative, cultural, economic and commercial center of Portugal. Lisbon also serves as Portugal’s chief port.