Portal de Zamudio Kalea: Bilbao's Shortest Street

Bilbao's shortest street marks the exact boundary of its oldest walls. Portal de Zamudio Kalea is a historic crossing in the Casco Viejo (Zazpikaleak). It forms a small open crossroads where several old streets, including Somera, Artecalle, Tendería, Calle de la Cruz, and Cinturería, converge.

A Medieval Gateway

When Bilbao's defensive walls were constructed in the 14th century, most of the city's gates faced the estuary. The Portal de Zamudio, however, served as the primary landward gate facing inland toward the Txorierri valley. It took its name from the powerful Zamudio family, a noble lineage deeply involved in the medieval War of the Bands. Local tradition remembers this original gate as the breach through which Zamudio fighters launched raids against their rival Gamboino opponents.

The primitive 14th-century settlement originally comprised just three streets. Portal de Zamudio marks the structural boundary between this original core and the city's later outward expansion. As urban expansion was authorized in the late 15th century, the walls lost their military function. The original gate structure was eventually dismantled in 1573 to improve access to surrounding areas and suburbs.

Civic Functions and Historical Ties

Over the centuries, the immediate perimeter surrounding the crossing hosted essential municipal facilities. The site once contained an alhóndiga, which served as a public grain exchange, as well as the town's local jail before detention facilities were relocated in later centuries.

The crossing also holds a curious connection to the Americas. Martín Sánchez de Zamudio, a former mayor of Bilbao belonging to the namesake family, sailed to the New World in the early 16th century. He participated in the 1510 founding of Santa María la Antigua del Darién on the Isthmus of Panama.

Bilbao's Shortest Street Today

Measuring approximately 29 meters, Portal de Zamudio Kalea is officially the shortest street in Bilbao. Because the small square encompasses just one residential building, the street literally features only a single numbered doorway, or portal, perfectly matching its historical name.

Today, the crossing is a bustling pedestrian thoroughfare connecting the Siete Calles with Plaza Miguel de Unamuno. Five distinct cobblestone street alleys converge into this compact pocket of the Old Town. A classic cast-iron public fountain, restored by the urban rehabilitation agency SURBISA in 2006, provides fresh drinking water to passersby.

The area is framed by ground-floor taverns and shops, serving as a popular gathering point for txikiteo—the local tradition of social bar-hopping for small glasses of wine and pintxos. The trickling of the central fountain mixes with the lively chatter and the echoing clatter of glasses from the surrounding bars.