 The broadest river valley, along the Río Ulúa near the Guatemalan border, is Honduras's most developed area.Both Puerto Cortés, the country's largest port, and San Pedro Sula, Honduras's industrial capital, are located here, as is La Ceiba, the third largest city in the country.To the east, near the Nicaraguan border, the Caribbean lowlands broaden to an extensive area known as La Mosquitia.