The Algarve is an important landform in Portugal. The Algarve is the most popular tourist attraction in Portugal. The production of food, which includes fish and other seafood, fruit, oranges, carob beans, figs and almonds is economically important in the region. The Tagus river is the longest river in the Iberian Peninsula. It's 626 miles long. At the mouth of the river is Portugal's capital Lisbon.
Pena Palace is on top of a hill in the Sintra mountains above the town of Sintra, and on a clear day it can easily be seen from Lisbon. Saint George castle is a Moorish castle standing on a hilltop overlooking the Portuguese city of Lisbon and the Tagus river. The strong citadel dates back to a medieval period in Portuguese history, and is one of the main tourist sites of Lisbon. Belem Tower is also a strong tower located in Santa Maria de Belem in the municipality of Lisbon, Portugal. It is a UNESCO Heritage site because of the role it played in the Portuguese Age of Discoveries.