The zaouia/koubba of Sidi Ishaq is located beautifully on the Atlantic coast. It is a short caleche ride along sandy tracks from the small town of Sidi Ishaq some 3 miles inland. The caleche park is situated in the centre of the town just off the R301 which dramatically follows the coast as far north as Safi.
The final stage of the journey, when the koubba can first be seen against the surf and the track drops down to the small sandy delta of the dried up river, is spectacular.
I can find no information about Sidi Ishaq, other than the shrine is a part of the Regraga annual pilgrimage throughout the Chiadme region.