the centuries around the square of São Sebastião and Praça Gonçalo Velho (dedicated to the island's discoverer). Immediately around this urban core are the municipal hall, the gates to the city () and old customhouse buildings in front of the main roadway that follows the coast (itself passing the Fort of São Brás and Campo do São Francisco in the west). Other important landmarks include the Portas do Mar (Gates of the Sea), main tower of the SolMar Avenida Center mall and Theatre Micalense. International relations Twin towns—Sister cities Ponta Delgada is twinned with: San Leandro, California, United States, since 1970 Fall River, Massachusetts, United States, since 1978 Caué/Angolares, São Tomé and Príncipe, since 2000 Newport, Rhode Island, United States, since 2003 Pleven, Bulgaria, since 2007 Praia, Cape Verde, since 2008 Economy With a strong concentration of service activities, the municipality is an important industrial and agricultural centre. The Arrifes-Covoada basin is the main bread-basket on the island of São Miguel, in addition to all the parishes located around the rim of the Sete Cidades Massif. In 1999, 1039 companies had their operational seats within the borders of Ponta Delgada, roughly equal to 45.4% of the companies of the Azores. Of these companies, 4.4% were in the primary sector, 13.7% in secondary industries and 81.9% in the tertiary service sector. The volume of sales (in 2000) was equivalent to 1,458 million Euros, associated with the service industry, of which banking, computer programming/services, corporate and commercial services, as well as tourism, dominate. Tourist activity in Ponta Delgada accounted for 34% of the hotel occupancy in the region, of which 46% were overnight trips (1997). In addition, Ponta Delgada is the centre of administrative services in the region, with many of the governmental secretariats located in this municipal seat (including the Regional Presidency and several directorates). Several newspapers are published in Ponta Delgada, including Açoriano Oriental (one of the oldest continuing daily newspapers in the country) and the Diário dos Açores. Transport Served by an international airport in the parish of Relva (Ponta Delgada-João Paulo II International Airport), the municipality is the principal port of entry for goods entering and people arriving in the Azores. SATA International and SATA Air Açores have their head offices in Ponta Delgada. Near the harbour of Ponta Delgada a broad gauge railway was used several times to build and enlarge the harbor. The track used a