Parisian jobseekers present an abnormally high risk of long-term unemployment, all things being equal. It is a phenomenon specific to Paris and districts closest to the centre. This is a paradox in a job market particularly dense and active. In this article, we propose an explanation which combines the essentials of two mechanisms, Skill Mismatch and Spatial Mismatch. It is because Parisian jobseekers are geographically far from the jobs that suit their profiles that they present a high risk of long-term unemployment. This explanation is corroborated by a model of spatial regimes and correlated errors on the Ile-de-France data and local durations of unemployment