Hernani is a town and municipality located in the province of Gipuzkoa, Basque Autonomous Community, Spain. The town sits on the left bank of the Urumea river. It is located at a distance of 9.2 km from San Sebastián. The municipality of Hernani occupies an area of approximately 40 square kilometres and is bordered by San Sebastián, Astigarraga, Arano, Elduayen, Errenteria, Lasarte-Oria and Urnieta.

Gipuzkoa is a province of Spain and a historical territory of the autonomous community of the Basque Country. Its capital city is Donostia-San Sebastián. Gipuzkoa shares borders with the French department of Pyrénées-Atlantiques at the northeast, with the province and autonomous community of Navarre at east, Biscay at west, Álava at southwest and the Bay of Biscay to its north. It is located at the easternmost extreme of the Cantabric Sea, in the Bay of Biscay. It has 66 kilometres of coast land.