Any trip to Portugal should include some time in the capital and largest city, Lisbon. The sunset glow on the estuary of the River Tagus (Tejo) has given it the name of Mar de Palha, or Sea of Straw. This is the centerpiece of Lisbon's charm and one of its most attractive features. It also provides an excellent sheltered harbor, which has been the city's most significant economic attribute and the reason for its long-term importance.