SanJuan

San Juan is a toponym used in many Spanish-speaking places, but most prominently refers to San Juan, Puerto Rico, the capital and most populous city of the U.S. territory of Puerto Rico. Located on the island's northeast coast at the head of San Juan Bay, it forms the San Juan metropolitan area with adjacent municipalities. Founded in 1521 by Juan Ponce de León, the city grew rapidly as a strategic port and gateway to the Caribbean.

The historic core, known as Old San Juan, sits behind thick colonial walls and preserves a densely packed district of pastel buildings, plazas, and narrow cobblestone streets. Prominent features include the hilltop forts of San Felipe del Morro and San Cristóbal, which guarded the bay and the city against seaborne attacks. The area today is a major cultural and tourist district, with museums, restaurants, and the historic La Fortaleza, the governor's residence, dating from the 16th century.

In modern times, San Juan is a political and economic hub, hosting Puerto Rico's main government offices and financial institutions. The port handles cruise ships and cargo, supporting tourism and commerce. The city experiences a tropical monsoon climate with warm temperatures year-round and a distinct wet season.

The name San Juan is common in the Spanish-speaking world, applied to numerous towns and municipalities, including but not limited to the capital of Puerto Rico; other examples include San Juan, Argentina, and various districts and towns across the Americas.