Guaynabo is a city and municipality on the northeastern coastal plain of Puerto Rico, bordered by San Juan to the east, Bayamón to the west, Cataño and San Juan Bay to the north, and Aguas Buenas to the south. Spread over roughly 27 square miles and organized into nine barrios plus the downtown district of Guaynabo Pueblo, the municipality is home to about 89,000 residents and functions as one of the most established residential anchors of the San Juan metropolitan area. The municipality holds a foundational place in Puerto Rican history. It was at Caparra, within present-day Guaynabo, that Juan Ponce de León founded the island's first Spanish settlement and early capital in the early 16th century, before the seat of government moved to what is now Old San Juan. The Caparra Ruins remain a visible link to that era, and the city is still known colloquially as the "city of the conquistadors." Guaynabo has also cultivated a reputation as Puerto Rico's "capital of sports" through its athletic facilities and programs. Modern Guaynabo is defined by its suburban character: a blend of long-established urbanizaciones, condominium communities, and gated hillside neighborhoods that rise from the coastal plain toward the interior. Commercial corridors and centers such as San Patricio Plaza anchor daily life, while the municipality's location minutes from San Juan puts residents within easy reach of the capital's employment centers, universities, medical institutions, and cultural attractions. The municipality suits families, professionals, and commuters who want suburban-scale living, established neighborhoods, and gated-community options without leaving the San Juan metro orbit. Its mix of historic significance, hillside communities, and central location gives Guaynabo a distinct identity among Puerto Rico's municipalities.