The Adourflows through Boucau before flowing into the Bay of Biscay with Tarnos on the left bank and Anglet on the right. One of the rivers that flows into the Adour, the stream of the Esbouc Mill, runs through Boucau.
Neighbourhoods
Boucau is divided into nine neighbourhoods. These are:Montespan in the northMatignon in the northBeyré in the northBarthassot in the northLahillade in the centreRomatet in the centrePicquessary in the centreLoustau in the southSaint-Gobain in the south