The leaders of Spain and Portugal are holding their annual two-day summit, with possible joint energy and infrastructure projects due to be discussed.
Spanish Prime Minister Mariano Rajoy and Portuguese Prime Minister Antonio Costa are also expected to assess European Union issues, such as the bloc's future after the United Kingdom's departure.
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About a dozen ministers from each Iberian government are scheduled to attend the meeting, which began Monday in Vega Terron, Spain. The delegations boarded a boat that took them down the Douro River into Portugal.
The summit was to continue in Vila Real, about 400 kilometers (250 miles) north of Lisbon.
Last year, Spain's exports to Portugal were valued at more than 18 billion euros ($20 billion.) Spain also is Portugal's biggest export market.